What mpg are modern petrols getting

mengele · 02-02-2019 11:21PM #1

Is there still a big gap between the mpg that the same car does in diesel compared to petrol? Are most petrols still 10mpg behind the same diesel car?

Wishbone Ash · 03-02-2019 12:10AM

You're not really comparing like with like. It's ridiculous the amount of people driving diesels as run arounds thinking they are saving money.

mengele · 03-02-2019 01:33AM

Wishbone Ash wrote: »

You're not really comparing like with like. It's ridiculous the amount of people driving diesels as run arounds thinking they are saving money.

But if you are getting more mpg then you are saving money. That's fact.

ham_n_mustard · 03-02-2019 01:41AM

Higher purchase cost, higher servicing cost, not to mention possible DPF issues due to driving style... False economy. Unfortunately a lot of people can't see beyond the "cheap tax"

NIMAN · 03-02-2019 01:42AM

mengele wrote: »

Is there still a big gap between the mpg that the same car does in diesel compared to petrol? Are most petrols still 10mpg behind the same diesel car?

I'd say you are about right with that estimation.

My 1.6 bluemotion Golf diesel is getting 55mpg long term, according to the on-board computer, which is probably accurate (unlike the 68mpg that VW say I'll get).

I would guess same car in a TSi petrol engine would be getting low 40s mpg?

JoeA3 · 03-02-2019 02:16AM

In my experience, like for like (ish), the diesel car will still give you at least ~10 more mpg. Now if you’re driving is strictly limited to city hopping around, then don’t buy a diesel, as that mpg gap closes and your dpf will possibly give you bother. But if you do a good mix of journey types and the car gets a decent warm up regularly, even if total overall miles aren’t that big, then yeah, I think diesel is fine and you will save at the pump.

There’s a lot of repetitive negativity towards diesels on the forums and undoubtably much of it is justified but there’s also a lot of hyperbole. I’d say the vast majority of my family, friends, colleagues drive diesels and I rarely hear of any horror stories. They do still suit a lot of Irish motorists, particularly those living outside of Dublin.

NIMAN · 03-02-2019 03:32AM

afaik, petrol cars also have particulate filters?

If so, are they as susceptible to being damaged/clogged etc as diesel ones are with city driving? Do they need a good run to clean them out as well?

Neilw · 03-02-2019 01:32PM

NIMAN wrote: »

afaik, petrol cars also have particulate filters?

If so, are they as susceptible to being damaged/clogged etc as diesel ones are with city driving? Do they need a good run to clean them out as well?

Petrol engines warm up much quicker and hence the particle filter works as it should, diesels take a lot longer to heat up and need a long run for the filter to work properly.

I can't see petrol filters having the same issues as diesel but it's early days yet, petrol filters seem to have only been introduced in the last 6 months or so.

03-02-2019 02:29PM

ham_n_mustard wrote: »

Higher purchase cost, higher servicing cost, not to mention possible DPF issues due to driving style... False economy. Unfortunately a lot of people can't see beyond the "cheap tax"

Purchase costs are broadly similar, servicing does not cost more and dpf issues don’t happen on newer cars as dpfs have been much improved from years ago when they were first introduced and gave problems early but people keep taking about it like it’s still happening.

ShadowHearth · 03-02-2019 03:16PM

I am getting right now 7.4l per 100km with 192hp 1.8tsi engine. The driving style is far from
Economy style, but 90% of it is Cork Limerick road. Very little city driving.

If I do drive it in economy mode I get it to 6.9l per 100km. Could get less if I would be completely dead inside.

It's not diesel efficiency, but it's not bad, specially compared to older petrols.

mr_edge_to_you · 03-02-2019 03:22PM

1,0 litre TSI Skoda Octavia, doing 20-30km a day over short journeys - 46mpg. Fairly happy with that.

Rusky rusky · 03-02-2019 03:31PM

1.0tsi dsg golf estate, mixed driving 50km/day though mainly on hilly backroads in cork - 5.6-5.8l/100km in winter (brim to brim)

Rusky rusky · 03-02-2019 03:34PM

Bishop Clean Lanyard wrote: »

Purchase costs are broadly similar, servicing does not cost more and dpf issues don’t happen on newer cars as dpf have been much improved from years ago when they were first introduce and gave problems early but people keep taking about it like it’s still happening.

VW diesels are 2-2.5k more expensive than equivalent petrols. Ford Focus diesel is 2.2k more expensive. Hardly similar purchase prices

The Bishop Basher · 03-02-2019 03:40PM

ham_n_mustard wrote: »

Higher purchase cost, higher servicing cost, not to mention possible DPF issues due to driving style... False economy. Unfortunately a lot of people can't see beyond the "cheap tax"

Here we go again..

Can you break down this “higher servicing cost” for us please..

micks_address · 03-02-2019 03:42PM

Bishop Clean Lanyard wrote: »

ham_n_mustard wrote: »

Higher purchase cost, higher servicing cost, not to mention possible DPF issues due to driving style... False economy. Unfortunately a lot of people can't see beyond the "cheap tax"

Purchase costs are broadly similar, servicing does not cost more and dpf issues don’t happen on newer cars as dpfs have been much improved from years ago when they were first introduced and gave problems early but people keep taking about it like it’s still happening.

I would say a bit of an unknown at the moment is how dpfs will last as they are being pushed a lot more to meet the real world emissions testing.. I know say the new Honda diesels need service at 10k km not sure re the petrol intervals.. you might get 55mpg from a 1 little vw petrol but not if you push it hard.. a 2 litre diesel will do 55mpg unless you are doing a lot of stop start driving and you'll have 150bhp at your foot. I know which driving experience I'd prefer.

I'm in year two or a PCP on diesel Octavia so interesting to see what the landscape will look like in 12 months or so. Theres a lot talk of buy petrol but I reckon my fuel costs would increase by 25 Percent, tax a bit more expensive to.. impg is one thing but petrol is still a good 5 to 7 cents a litre more expensive at the pumps..

micks_address · 03-02-2019 03:45PM

Rennaws wrote: »

ham_n_mustard wrote: »

Higher purchase cost, higher servicing cost, not to mention possible DPF issues due to driving style... False economy. Unfortunately a lot of people can't see beyond the "cheap tax"

Here we go again..

Can you break down this “higher servicing cost” for us please..

I'm not anti diesel but the new honda diesels requiring service at 10k km is daft.. that would be nearly three services a year for me. My brother has a vw sharan and it needs a new egr and few more bits costing in excess of 2k.. admittingly they are only doing short journeys so that's probably the main problem.

03-02-2019 03:45PM

Neilw wrote: »

Petrol engines warm up much quicker and hence the particle filter works as it should, diesels take a lot longer to heat up and need a long run for the filter to work properly.

I can't see petrol filters having the same issues as diesel but it's early days yet, petrol filters seem to have only been introduced in the last 6 months or so.

Modern aluminium diesel engines heat up plenty quick, particularly if the cooling system has been designed from the ground up to reach optimal temperature ASAP.

03-02-2019 03:47PM

micks_address wrote: »

I would say a bit of an unknown at the moment is how dpfs will last as they are being pushed a lot more to meet the real world emissions testing.. I know say the new Honda diesels need service at 10k km not sure re the petrol intervals.. you might get 55mpg from a 1 little vw petrol but not if you push it hard.. a 2 litre diesel will do 55mpg unless you are doing a lot of stop start driving and you'll have 150bhp at your foot. I know which driving experience I'd prefer.

I'm in year two or a PCP on diesel Octavia so interesting to see what the landscape will look like in 12 months or so. Theres a lot talk of buy petrol but I reckon my fuel costs would increase by 25 Percent, tax a bit more expensive to.. impg is one thing but petrol is still a good 5 to 7 cents a litre more expensive at the pumps..

Many people forget the fact that diesel is cheaper at the pump too, so it costs less per mpg also.

Rusky rusky · 03-02-2019 03:49PM

micks_address wrote: »

I would say a bit of an unknown at the moment is how dpfs will last as they are being pushed a lot more to meet the real world emissions testing.. I know say the new Honda diesels need service at 10k km not sure re the petrol intervals.. you might get 55mpg from a 1 little vw petrol but not if you push it hard.. a 2 litre diesel will do 55mpg unless you are doing a lot of stop start driving and you'll have 150bhp at your foot. I know which driving experience I'd prefer.

I'm in year two or a PCP on diesel Octavia so interesting to see what the landscape will look like in 12 months or so. Theres a lot talk of buy petrol but I reckon my fuel costs would increase by 25 Percent, tax a bit more expensive to.. impg is one thing but petrol is still a good 5 to 7 cents a litre more expensive at the pumps..

You are comparing 1.0tsi to 2.0tdi? The price difference between two (both dsg as no manual 2.0tdi on Skoda website) is €4770!

Wildly Boaring · 03-02-2019 03:50PM

mr_edge_to_you wrote: »

1,0 litre TSI Skoda Octavia, doing 20-30km a day over short journeys - 46mpg. Fairly happy with that.

Seriously?
My missus is driving an ateca 1.0 tsi since Jan.
Short journeys.
38 or so mpg so far.

About what I expected when buying. She's dissappointed, I'm not.
Will run to about €120 extra on juice annually for her low mileage over the kuga she had.
At least 2k cheaper than the diesel and no dpf or egr worries.

micks_address · 03-02-2019 03:52PM

Rusky rusky wrote: »

micks_address wrote: »

I would say a bit of an unknown at the moment is how dpfs will last as they are being pushed a lot more to meet the real world emissions testing.. I know say the new Honda diesels need service at 10k km not sure re the petrol intervals.. you might get 55mpg from a 1 little vw petrol but not if you push it hard.. a 2 litre diesel will do 55mpg unless you are doing a lot of stop start driving and you'll have 150bhp at your foot. I know which driving experience I'd prefer.

I'm in year two or a PCP on diesel Octavia so interesting to see what the landscape will look like in 12 months or so. Theres a lot talk of buy petrol but I reckon my fuel costs would increase by 25 Percent, tax a bit more expensive to.. impg is one thing but petrol is still a good 5 to 7 cents a litre more expensive at the pumps..

You are comparing 1.0tsi to 2.0tdi? The price difference between two (both dsg as no manual 2.0tdi on Skoda website) is €4770!

Thread title is asking about mpg not cost

Fann Linn · 03-02-2019 03:57PM

Wildly Boaring wrote: »

Seriously?
My missus is driving an ateca 1.0 tsi since Jan.
Short journeys.
38 or so mpg so far.

About what I expected when buying. She's dissappointed, I'm not.
Will run to about €120 extra on juice annually for her low mileage over the kuga she had.
At least 2k cheaper than the diesel and no dpf or egr worries.

My 'modern' 05 Primera petrol got me up to Dublin & back yesterday @ 44.7 mpg.
No problem at all to it.

Heres Johnny · 03-02-2019 03:59PM

Not a modern petrol engine but I moved from a BMW E60 523i last summer to a F10 530D. The E60 petrol was getting about 12l/100kms average in the mixed driving I did. The 530D on board computer has a long term average stored since the car was first driven and it's 8.3l/100km. We also now have a 2.0 TDI Audi A6 in the house and long term average is 7.4l/100kms.
Both cars are 2014, the e60 was a 2006. All automatics.
So the newer diesels are about 50% more efficient than the older petrol.

IsaacWunder · 03-02-2019 04:05PM

Bishop Clean Lanyard wrote: »

Many people forget the fact that diesel is cheaper at the pump too, so it costs less per mpg also.

It fluctuates, but on average diesel is cheaper at the pumps owing to lower excise duty (tax on petrol is about 10c more per litre than diesel).

micks_address · 03-02-2019 04:13PM

IsaacWunder wrote: »

Bishop Clean Lanyard wrote: »

Many people forget the fact that diesel is cheaper at the pump too, so it costs less per mpg also.

It fluctuates, but on average diesel is cheaper at the pumps owing to lower excise duty (tax on petrol is about 10c more per litre than diesel).

I guess the biggest barrier to raising diesel prices would be the haulage industry.. if the government put ten cents a litre on deisel I'm sure would send a lot if people toward petrol or hybrid or electric

Wildly Boaring · 03-02-2019 04:37PM

Fann Linn wrote: »

My 'modern' 05 Primera petrol got me up to Dublin & back yesterday @ 44.7 mpg.
No problem at all to it.

I dunno what petrols ye boys drive. My brothers 04 leon was more like 35mpg on that drive.

Doing 80kph down the motorway and freewheeling down hills?

I get 42mpg from my diesel kuga, dad gets 45 or so from same.

As I said wife gets 37 or 38 mpg from ateca petrol.

Brother bought a focus estate petrol last year. Gets about 35mpg. He does drive hard I'd admit.

Maybe some people worry a lot more about efficiency than me.

cnocbui · 03-02-2019 04:42PM

ham_n_mustard wrote: »

Higher purchase cost, higher servicing cost, not to mention possible DPF issues due to driving style... False economy. Unfortunately a lot of people can't see beyond the "cheap tax"

It's happening all over again with electric vehicles.

micks_address · 03-02-2019 04:43PM

Wildly Boaring wrote: »

Fann Linn wrote: »

My 'modern' 05 Primera petrol got me up to Dublin & back yesterday @ 44.7 mpg.
No problem at all to it.

I dunno what petrols ye boys drive. My brothers 04 leon was more like 35mpg on that drive.

Doing 80kph down the motorway and freewheeling down hills?

I get 42mpg from my diesel kuga, dad gets 45 or so from same.

As I said wife gets 37 or 38 mpg from ateca petrol.

Brother bought a focus estate petrol last year. Gets about 35mpg. He does drive hard I'd admit.

Maybe some people worry a lot more about efficiency than me.

You'll get it out of a 1 litre tsi or Civic petrol 1 litre but if you want more than 115bhp then you won't.. or if you are heavy footed ..

easyvision · 03-02-2019 04:46PM

I had a 131 1.4TSI golf before, I would get 45-50MPG depending on driving style etc. Once got 55MPG on a journey driving steady! My 151 GTD gets the exact same MPG in constant sport mode. Old petrol engines are nowhere near as efficient but newer ones are, the gap of efficiency is narrowing. Now if I was comparing a 2L petrol TSI like a GTI there is going to be an obvious difference. Also I have heard re new Ateca, new engines need to be broken in, should climb a few MPGs within a year supposedly.

Rusky rusky · 03-02-2019 05:20PM

micks_address wrote: »

Thread title is asking about mpg not cost

You were talking ab better driving experience in a 150hp 2.0tdi vs 1.0 tsi. It costs almost 5k.
Yes, diesels are more economical as diesel fuel has 20% more energy than petrol and diesels engines are more efficient at burning it. No surprise that petrol is less efficient than diesel

medic112 · 03-02-2019 06:07PM

181 Peugeot 5008 1.2 approx 600km per 50ltr. Mixture of roads.

What mpg are modern petrols getting

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