I'm thinking that a properly tuned American small block v8 powering a relatively light weight vehicle, such as a small pickup or mid sized RWD car, should be capable of low 30's mpg. Of course there are many many variables that would have to be sorted out, and building one of these vehicles for FE is nearly anathema to the whole point of putting an American v8 into a lightweight car....but I don't really see why we couldn't haul mass while growing grass.
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