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Originally Posted by Kuan
OK explain this to me someone. You're going 70 mph, 2500 rpm, you get 25mpg. You're going 70 mph, 2500 rpm, headwind of 20 mph. Engine revs the same, same gear, same amount of air goes in the plenum, fuel economy goes down coupla mpg's. Why?
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with the headwind, you now need a wider throttle opening to maintain the same speed. Your intake manifold pressure will now be higher, and this means that more air/fuel is now going into the engine.
you can see this in your fuel economy gauge.