Some 156 advice needed guys?! - Page 2 - Alfa Romeo Forum
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Re: Some 156 advice needed guys?!

When you point out the cars of similar size and aerodynamics should have approximately the same fuel consumption at a given speed, this does not take into account combustion chamber efficiency at part throttle which does have a large effect on consumption. Funny thing is that quite often, a remapped car will have better consumption because the original map was primarily developed to keep emissions low. I know it shouldn't work like that, but the effects of lean burn can often do just that. (It doesn't help CO2 emissions though.)
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Re: Some 156 advice needed guys?!

It also depends on the cars gearing.

At a steady speed a car doing 3000 rpm will use 25% less fuel that one doing 4000 rpm. Providing all other things are equal, air resistance, engine capacity etc.

Also at a steady speed a turbo car can be more efficient than a normally aspirated one. Even at identical engine speed the turbo by forcing air into an engine can reduce the pumping losses experienced in a normally aspirated engine.
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