Quote:
Originally Posted by nsx042003
what? why does it matter? mpg or pgm, it's just a reference to show how much fuel a car uses to move a certain distance. As long as you don't cross reference (ie: mpg vs pgm), I don't see the point of saying which metric is better.
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because mpg is generally a non-linear expression...which makes comparison difficult & confusing especially when you start looking at the more extreme ends..
Example: when you compare 50mpg vs 70mpg...the 20mpg difference looks huge
However, when you do the calculation, that 20mpg difference will only save you 1.3L of gas over a 100km trip.
On the other hand, when you compare 10mpg vs 30mpg (also 20mpg difference),
this 20mpg difference will now save you 15.7L of gas over the same 100km trip...