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Once the engine is installed you should find the base line for engine fuel consumption. Here's an article from '09 Mother Earth News:
motherearthnews / green transportation /100mpg car
He ran the engine at hwy rpm in park and measured fuel usage. The difference between that and actual mpg is friction and aero drag.
You don't want to go chasing the unattainable.
I can't post the link but that should be enough for a search.
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