>> There isn't a linear relationship between the rotational speed of the 
>> wheels and the speed of the engine.
> 
> There is, in a (relatively primitive) manual transmission.

Indeed.

> There is not, 
> however, a linear relationship between engine RPM and gasoline usage.

No - that would depend on the smoothness of the road, the inclination, 
wind speed, and a bunch of other factors. Even so, I would expect it to 
be possible to come up with an *approximate* number for fuel used per 
cylinder.

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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