All I can say is I got this in today thanks to David at Northride 4x4, and it's freakin awesome! I updated on my laptop the walked out and plugged it in. The easiest thing ever! I averaged 20.3 mpg on backroads 15 miles stop signs and running anywhere from 35 to 55, and that was on the 87 octane not Mileage XS. Oh yea didn't mention I run 35s which actually measured 34.25.

 

I'm bummin'... can't seem to get my speedo adjusted. Here is my configuration:

Running 91 Fuel
Tires: 37
Axle Ratio: 05.13 (modified gearing)
TCaseHigh: 0.100
TCaseLow: 0.400

 

Shouldn't the high be 1.000 (1 to 1 gearing) and the tcaselow be .250 (4:1)

 

Stock config. should be:

TCaseHigh: 0.100
TCaseLow: 0.400

.Superchips recommended I switch the tire size to 38.25

Will report back.

 

After a week of the superchips engineers sending me updates, I still can only look at the VIN number. Error G-3F seems to be thier achilles heel. If I didn't know better I'd think this thing is broken.

 

Damn speedo is still off!

 

Measure the actual tire height not the sidewall marking

 

Im debating trying the mileage tune.. anybody notice anything good out of it?

 

I tried the mileage tune. The only thing I noticed was a change in shift points and perhaps a little loss in seat of pants power. The mileage did not change from the 87 tune. I have since gone back to the 87 tune.

 

Same here. I noticed shifting to next higher gear occurs a couple hundred RPM sooner. If you keep your speed relatively slow (~60 MPH) on the highway, it may increase fuel economy, but it shifted into OD too soon for my taste.