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Originally Posted by Guywithface
I'm new with mechanics and I want to learn more about cars so my question is if the perfect ratio of gas to air is one part gas 14.7 parts air and the throttle controls the amount of air the is taken into the engine then wouldn't driving faster be more fuel efficient?
And why is it that mustangs get 18-20 mpg but honda civics get 40-45 mpg even though they have the same gas to air ratio?
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your question can be answered with power to weight ratios and engine displacements. the civic is much lighter has a 1.5 or so cc engine where as the mustang has between a 4.0 lier to a 5.0 liter engine and is literally built heavier. a mustang is quiter going down the road, developes less body interior squeeks than does the civic and even the interior plastics are heavier constructed. One day maybe the American cars will be mostly carbon fiber shelled who knows.