What size engine for the online/Youtube EC?

pittsburghracer said
Problem is I know better. The 360 I built for my 1976 dodge van to tow with got better gas mileage than my old 318. At least it did when I kept my foot out of it.
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the more they labor, the more the 360 will have the advantage in the MPG. But this challenge is in a 2900 Dart. :)