local Jet garage had a "sale" one weekend and sold so much fuel they are doing it fairly regularly.

Funny you mention Jet. Our local Jet garage (we thought) was always the cheapest, especially if you re-fuelled at weekends, they always run offers then. Last weekend we were driving back home from a well known Sunday market near you and saw a supermarket was selling for (I think) £0.71p/l, our local jet was £0.725/l. Ok, this is penny pinching but I resent our fuel prices and I was passing anyhow

Handy when you have two cars that do 15-20mpg each, and everyone else complains they "only" get 35

My old 1.6l petrol car does 35mpg urban, her (old) 1.6 diesel 50mpg, exactly the same car but different fuel type. Sorry, I hate my mpg and my next car will be a turbo diesel I don't know what car you drive at 15-20mpg but I'm guessing I'd enjoy it's performance (in between petrol station stops that is)