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When my low fuel light comes on and I assume I have about 3 liters left, how many kilometers can I go on those 3 liters if my fuel consumption is 4.7L/100km? If I have a gallon left, I know I can go 33 miles at 33 mpg.
There's nothing particularly "better" about one or the other; some measurements are better for different reasons. I can easily divide 2,700 miles by 34 mpg and figure out how many gallons I'll have to buy to make the trip.
BTW, whenever this type of article comes out on Slashdot or Fark, the "independents" trot out the "see, Priuses are a waste because a hybrid truck saves more gas." While driving home, I can see that 90% of the SUV and pickup drivers on the road should be trading in that single-occupancy 10 mpg truck for a 50 mpg car instead of a 20 mpg truck.
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