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Food for thought: In gasoline engined vehicles with multiple engine choices, the smallest engine variant (in the US) virtually always has the highest fuel economy. It's an exception when going bigger helps anything.
It is possible to go too small, and cause the engine to run out of its optimal BSFC range, but there are vans in Europe with sub-2L engines, which deliver in excess of 30 and sometimes in excess of 40mpg.
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