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Originally Posted by Purple AK Paul. I got 29mpg on a 300 mile run back from Elvington last year at a steady 70-80mph. (75mph is 2000rpm in 5th) Although mine is a fairly standard 351 Cleveland with a 3.31 diff and a tall 0.63 5th gear  |
My STD chevy would only do 15 to 18mpg max. Thats when I was driving it to Scotland. Also 70mph at 2000rpm.