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If I accelerate my car from 70mph I can watch my petrol gauge nosedive
At constant power, speed would reduce as you climb a hill, and increase as you descend - you should be more than aware of this as a cyclist.
Quote from: DoctorBeaver on 15/05/2007 11:33:57If I accelerate my car from 70mph I can watch my petrol gauge nosediveIf by that you mean your car is very inefficient on fuel above 70mph, then that implies that it has poor aerodynamics (that is not necessarily a criticism, since at low speeds, aerodynamics are less important than other factors).If you simply mean that you consume fuel under acceleration, but that is misleading, since the real wastage of fuel tends to happen under braking (unless you have a vehicle capable of regenerative braking).
When cruising on the motorway at around 70mph I get about 30-35mpg. While I'm accelerating the gauge shows 10-15mpg, or less if I really give it some welly! Under braking or going downhill with my foot off the throttle the gauge goes past 50mpg.
So are you telling me I shouldn't brake? Could I use that as my defence if I get caught speeding? 
Anyway, if QM is right, they can't prove both that I was in that place and doing that speed.