Too many to put down on paper.
For example, temperature, atmospheric pressure, tyres, road condition etc, all have a bearing on mpg.
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In a pickup truck you might get 10 to 14 miles per gallon if you drive conservatively with a 7.4 motor. The same motor in an RV might be lucky to get 7 to 10 miles per gallon.
If it were a gallon of liquid hydrogen, you might get a couple miles but a gallon hydrogen gas is not enough to do much
You can get 15 miles per gallon in city, 24 miles per gallon on the highway for 2009 model. On average, the Cadillac XLR will range from 20-30 miles per gallon. However, many things depend on the actual gas mileage. Road conditions, traffic, and speed limit will affect how many miles one gets from a gallon of gas.
20 miles to the gallon 20 miles to the gallon
15 miles to the gallon 15 miles to the gallon
(758 miles) x (4 dollar/gallon) / (14 miles/gallon) = $216.57 (rounded)
About 21.4 miles per gallon. (300/14 = 21.4)
Between 13 miles per gallon and 16 miles per gallon.
It might help if you said what the cost of gas was!
18.5 miles a gallon