How often you stop for gas is surely better covered by a "range" measurement for the car? Maybe it's different in the states, but all the cars I've ever been i

How often you stop for gas is surely better covered by a "range" measurement for the car? Maybe it's different in the states, but all the cars I've ever been in show your remaining fuel as a fraction of a tank. In that case, volume of fuel is completely irrelevant, so MPG vs liters/100km has not place. e.g. My tank takes me 400 miles => I have half a tank left => I can go another 200 miles ...is exactly equivalent to... My tank takes me 600 km => I have half a tank left => I can go another 300 km (For the purposes of this post, 1 mile = 1500m. If the size of a gallon changes with locale, why not a mile? :-p )