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I averaged 12.6 mpg. on my last tank of fuel. This is in my 71 with a tired old 455 with a 2:56 rear and a decent tune. My driving is mostly city, some rural but NO freeway speeds.
In my opinon, cars guys allways want more power. So I say 455 all the way. The difference in fuel economy is small but debatable.
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1971 cutlass S 455/th400
Last edited by don71 : 10-28-2007 at 11:53 AM.
Reason: rear gear info
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