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That's not relevant to the comparison in any way.

fair enough. misread your comment

A tank of gas is still a tank of gas, regardless of what it gets used for.

Energy in = energy out + waste + energy stored

The truck is barely storing anything on average, so what you've described is energy out and waste, but the calculations to compare the truck to the landfill was done on Energy in - the amount of gas that it needs to be filled with.

For the same total job, you could raise or lower how quickly the truck goes through a tank of gas, but that variance has already been averaged out

Only Soviets kept using gas engined trucks and buses past the 50s

And, for some insane reason, the average American commuter.