Re: 120/160 & Clipper version & Twelve fuel economy

Posted by Owen_Dyneto On 2013/1/20 23:20:13

My 56 Carib with Ultramatic and a 3.54 rear axle and the dual Rochesters gets about 14.5 mpg on Interstates at a reasonably steady 65 mph. Correcting for the mileage penalty with ethanol-containing gasoline, this would equate to about 15.5 mpg with the gas of the era.

I've never managed to average anything near 65 mph in my 34 Eight; it gets about the same around town as it gets at a steady 45 mph, about 8.5 to 9 mpg.

A friend who owned and toured in a 37 Twelve claimed he got about 8 mph at sustained highway speeds.

My old 48 Custom Eight with overdrive used to get about 17-18 at highway speeds but that was with ethanol-free gas, so with today's gasoline that would be perhaps 16 mpg, pretty much agreeing with JoeSantana's result.