i happened to think to look at their web site.

for a dodge they offer three applications:
1. 28.6% od on an older four speed = 25 to 28% better fuel economy.
2. for the five speed trucks they offer a 22% od and say it = 20% better economy.
3. and for a six speed like mine they offer 28% od and claim 20% better fuel economy.

they don't say whether it is for diesel or gas, but they have power graphs for all the recent gas and diesel engines. the 5.9 cummins for example has a torque peak at 1300 rpm and max hp at 2750.

when i am towing with mine i shift at 3000 and it drops the rpm down to about 2000 and thus keeps the boost on pretty well.

i dont know if they have used actual engineers on these figures or not.

you can decide for yourself whether this qualifies as near the same percentage or not.

they also offer them for cars with a lot of pro street and such shown. i didn't look at that though.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.