Do a search of the 1994 mustang powered by a duramax (Its owned by Mike Wood) It has ran 9.91 in the 1/4 mile (it has done mid 9's at ~145 mph now, but couldn't find tbe link), street legal and street driven, and over a 900 mile trip he averaged about 35 mpg at 75 mph!
Obviously a lot of work went into that car, but that certainly doesn't seem like a s*** motor to me.
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