agree with the rest, 140 minimum, not that you have to go fast, but works the engine less at cruising speed.
as far as hpdi's or optis, i think the way they work their magic is by running right on the edge blowing up. as long as everything works, it's golden. when it fails , it;s major.
if your looking at 2 stroke, i'd look at at 2000-2004 carbed. great performance and easy mechanics. just fuel mileage sucks. but lets face it 2 mpg vs 4mpg is a 100% increase, but it's still only 4mpg ,
takes ponies to push a boat and ponies like to eat.
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