Question:
In theory would a heavy car with a big engine be more fuel efficient one with a small engine?
Just something I’ve been thinking of lately. The main thesis behind all of this is that a heavy car with a big engine has to use less RPM to get it going, while a smaller engine has to rev higher = increasing the fuel consumption. An example would be between 728 and a 740. Tell me what you think.
Answer by Pat
If both vehicles had the same gear ratio at the final drive then your theory
would be correct… however they will not use the same gearing on a car
that produces way less power… power to weight ratio is usually the
determining factor.. thus making a vehicle that is peppy to drive and
still get good mileage..
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By definition fuel efficiency is = Output/ calorific value of the fuel used.
Hence the efficiency depends on air fuel ratio at all operating conditions in whatever way you achieve it.
Rpm is a manifestation of the out put and not a determinant.
So Out put horsepower per gram of fuel is the correct way of measure!
Who cares about fuel efficiency? Buy a small car and fit it with a big engine so you can be the fastest