Over the last few months my mpg has been steadily increasing. I don't have a clue why - my driving routes/profiles are the same and I haven't changed fuel (always use standard supermarket fuel). I used to get about 485 miles to a full tank, but now it's up to 520 miles - quite a significant jump. Any ideas why?
LS460 - four years old, 35,000 miles on the clock.
Mainly driven to and from work - motorway about 33 miles each way.
Normally stick to about 70-75 on the motorway.