I have a V6 and I find that at around 63 mph i get fantastic gas mileage. from PDX to Bend is about 150 or so miles and at 63 steady minus passing, i only used a quarter tank. and mines only got 58k on it. My '77 has a 350 V8 so I got the HP covered until I can get my 383 kit installed. and then its the '10 Z28 or SS for my super fun V8
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