MPG or l/100km nothing has to do with time, only distance and speed related consumption. If you need to make 100 unit of distance, and you have 100 unit of fuel, if the consumption is less than 1 fuel on one distance you will make it, if more not. More speed means more consumption so if the available fuel is a constraint, you need to go slower.
About 80km/h, 50mph, smaller cars are generally able to go a little faster and larger ones slower but it averages out to about 80/50. Faster than that you're burning fuel to fight air resistance. Slower than that you're in a lower gear and not getting an efficient burn.
You use fuel per distance traveled: for example, my car, when traveling 80km/h consumes fuel 4.5l/100km. When I drive 100km/h the consumption is 5.2l/km. (I just had a 600km roadtrip for a sports event and the average consumption came out as 4,8l/km). More speed equals more power output equals more fuel consumption.
The time it takes to travel the distance/consume the fuel counts for very little, as the consumption is relevant to the distance traveled and the least amount of consumption comes when the engine operates on its optimal operating range of revolution aka most output for fuel consumed.
So slow (but not too slow, optimal range remember) and steady wins the race.
Depends on the car, different cards have better mpg at different speeds. Some might me more efficient on a motorway compared to others more suited for a city
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