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Originally Posted by CGameProgrammer
Gallons per hour is completely different from L/100km or miles/hour because it fails to take movement into consideration. If one car is burning two gallons per hour and the other is burning three per hour, which is more efficient? Well you can't say. If the 2 gph car is going 20mph and the 3gph car is going 60mph, then you know the 3gph car is in fact the more efficient one, since the first is evidently doing 10 mpg and the second is getting 20 mpg.
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I meant to specify gallons per hour for things like accessory load, which are the same regardless of vehicle speed. I often see reports that air conditioner use will cost X mpg or X% of fuel economy. However, a fixed load like an air condioner would appear smaller in proportion to a faster vehicle speed. I just now corrected my post -- you are correct in that respect though that gallons per hour would be out of context without knowing exact speed.