On a 2.3% grade was my test. I gues I should have worded a bit differently. Terminal velocity is what I am looking for. (my T.V. Went up a little over 15 MPH. From 65 to over 80, with the cops in NY I didn't want to go further and get another ticket)
I did a 4" frront and 5" rear drop. Later because of chewing threw fender wells I added a 1.25" rubber isolated from a Superduty (with modifications). I went from stock avg 16-17 mpg all the way up to 20-23 mpg. (also tuned and k&n air filter) from about 300 miles per tank to over 400 miles per tank. My wallet gives me little kisses every night.
With the overall ride height I don't remember what the exact numbers were but with in a range of +- .25". I only really paid attention to the ride height while experimenting with + and - sized tires. Then back to stock. (it's nice having other vehicles to use for swapping rims and tires.)
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