Rockr69 Posted October 29, 2007 Share #37 Posted October 29, 2007 76 w/5spd, 80mph and below 22-25(about 350 miles per fill). Over 80, forget it! Link to comment Share on other sites More sharing options...
Rockr69 Posted October 29, 2007 Share #38 Posted October 29, 2007 to Sailorbob, with the four speed my 60mph rpm range was 3k after 5 spd, 2250. I can't say what increase in mileage I got, but it sure made cruising a lot nicer. Link to comment Share on other sites More sharing options...
sblake01 Posted October 29, 2007 Share #39 Posted October 29, 2007 I've done several at home. All I ever use is 4 tall jack stands and a transmission saddle on my floor jack. Link to comment Share on other sites More sharing options...
turbo240 Posted October 29, 2007 Share #40 Posted October 29, 2007 Its kinda funny how the stock & modified Zs are getting about the same mileage.my 78 (flat tops, big TB, 6-1 header, 4 speed) gets around 25-27mpg highway. It has a tendency to get right around the same mileage if I drive like a granny or if I pin it everywhere.my old 72 with a crown turbo kit got about 18mpg (with a 2" Jag SU) Link to comment Share on other sites More sharing options...
Parman
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