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That's a tough one... the ratio in fuel wasted is:
Vspeed up^2:Voriginal^2
Often you are going 50kph or so, and you might have the choice of speeding up to 60kph. So that's 36:25 ratio, not a lot of difference, but if you gamble and lose, you pay even more. And if your car is anemically powered, the gamble is not a good one at the best of times.
If you could only hear me curse in the instances where I have gambled on a speed up and lost!
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"Every body perseveres in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by force impressed." - Isaac Newton
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