wow, well, I washed the filters and pumped up the tyres and it feels like a formula 1 (only kidding about F1!)
I notcie fuel is less dense when warm so - in the summer maybe it is a better idea to fill up at the pumps with your . .tenner of fuel in the early morning, realising it may seem unfair, sending your wife out to re-fuel at 5 a.m, with the kids for company, but you would actually get more grams per litre.
S.G and all that.
Also- the tyres as you mentioned, as you said, buckle their form more on warm/hot roads and are squashier providing more resistance, result is pump them up to their highest service level/pressure/limit thang, preferably without blowing them up.
Air filter has to be clean or (even with a diesel) it would tend to run rich, providing less combustion or moreover same combustion, thats it, same combustion for more fuel - wow, who thought this could get interesting?
Again thanks to all.. By the way MPG readout

, guys, I appreciate the . . compliment but my car is a cross between a wheelbarrow and a limo - on a scale of 1 to 10, 10 being a limo - it is definately a 1.
You are all talking A320 - am talking C150.

- but one day . . . .