if im not mistaken the gas tanks underground are pressurized and keep the fuel at a constant temperature. If it were to expand the tanks would rupture. if you have the automatic and drive a lot best way to keep fuel consumption under wraps is to use the tip tronic and up-shift at 2600rpm, and keep the car at the highest possible gear at all times. The fully automatic mode takes in the throttle position as a variable and will let you rev up the engine in 3rd up to 4500rpm if not a bit more, before shifting to 4th,5th,6th, assuming you stop accelerating once you reach 60km/h. the mileage i got on my last tank was 9.2L/100km so its definitely doable.
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