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Well... i'de say 99% of my driving is city driving. Someone mentioned extended idleing, A lot of times I will accelerate to a little over the speed limit then let off the gas totally and letting it coast just cause I was trying to get higher gas mileage. Maybe that is part of the problem?
Contrary to common belief, coasting will get you lower mileage than if you left it in gear. When coasting your car does roll for longer because it doesn't have the engine friction slowing it down but the engine is using gas to stay idle. When in gear the engine friction is slowing the car down more but while doing so the engine uses no fuel at all as the speed of the car is enough the keep the engine above idle rpm.
 
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