Grant EuroFlame Condensing boiler

Hi,

I have a Grant EuroFlame Condensing boiler (90-120). It was purchased in October 2010.

Between the end of last November (2011) and start of May of this year, I used approx 750 litres of oil.

Now you might think that is not a lot, but because of work circumstances I was only staying in the house at weekends and the heating was used as sparingly as is possible. I have a stove in the living/kitchen area and that was used as the primary source of heat for the living area. Not to mention it was a very mild winter.

The heating was timed to come on on Tuesdays and Thursdays for 2 hours each, and then when I was there it would be used for approx 2 hours on a Friday, 4 hours on a Saturday and 2 hours on a Sunday.

There were 12 rads to be heated.
2 Large rads.
6 Average sized rads
2 Small rads
2 Towel rads

I was hoping to not have used as much oil as I did. There are two settings on the boiler (pictures attached) and I know these were interferred with by an inquistive brother of mine, so basically I am wondering if anyone would know if these settings are right/wrong and if they are impacting the efficiency of the boiler ?

Any tips/suggestions would be appreciated.

Thanks,
S