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Did you notice an improvement when you got the fat hips off the truck? The best I have EVER gotten is 16 MPG.
One thing I know will help is getting rid of the down pipe. I hear they had a 800 LB gorilla at the factory to sit on them before they put them in the truck.
I got a good improvement because the dually axle had 4.10 gears, and the SRW axle I swapped in has 3.55 gears. Plus less weight cause I switched to aluminum wheels.
An intake (6637 from Riffraff) and 3" downpipe were a big help too. Lets it breathe better.
I called the guy and it sounded like he was from "way down south", barely spoke english. Said that his truck looked just like it. I politely asked him to take down the picture. I don't think he ever did.
I'm in Prineville! Got in around 1:30pm. Took a drive up the crooked river, walked around with the baby and wife for a while, then swimming at the hotel.
Gotta find dinner soon...