Okay, since I'm the only one who has currently tested this I'll put in my 2 cents. In my Cobra which has 220 degrees duration at .050 I can cruise at 55 in 6th (.62) without lugging my engine. However, I pull less vacuum cruising at 55 than I do at 60.
When I ran my tests I pulled 27.202 mpg at 60mph and only 22.218 mpg at 55mph. However, I drove the same route but in different directions at the different speeds so my test is only half way done.
I will be driving the same route this Thursday so I will reverse my speeds so I have an acurate reading for both speeds in both directions. Also, the total miles driven were 131 miles.
And final, my car is also not typical. It's a '94 Cobra with a Votech blown 302 that made 433rwhp. I built the engine myself but had the tune done by Steve at Powertrain Dynamics.
Last edited by 94cobra69ss396 : 08-11-2008 at 05:28 PM.
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