Quote:
Originally Posted by DGthe3
Well, the EPA combined mileage rating for the V6 manual is 21 mpg.
Weight has minimal effect on highway fuel economy, aerodynamics and speed are much much much more important. Weight hurts when trying to accelerate, but once its moving at a constant speed, it barely enters the equation. On the other hand, going at 75 mph vs 65 mph means that you have 54% more drag on your car. Around those speeds, even slowing down 5 mph is worth around 25% less drag.
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Weight does have some effect in his case with hills and mountains. However, the .36 drag coefficient is quite hefty...it's the price you pay for a big Mustang-eating mouth on the front.