MyLS1Hauls

iTrader: (2)

Temps were 70-80*.

I'm fully aware of how the factory recommends 91+. It will pull timing at high loads on lower octane fuel, but I haven't seen it pull much, if anything, at cruise loads. Highway mileage is primarily dictated by what is happening at cruise.

Have you data logged your trucks timing at all? I've spent quite a bit of time doing it, since I've had it. I've been into tuning vehicles for over a decade. I normally run E85 (very abundant here, but harder to find where I was headed), but wanted to get some data for running 87. A friend of mine wants his tune optimized for 87, since he puts so many miles on. It was easier for me to just scan my identical truck.

shaw_426hemi

so when you tuned yours did you pic up any MPG? Im awaiting my BB tune and was hoping to get 1-2mpg highway more with the tune and the full exhaust I just put on. Sound feesable?

rjwz28

My mileage went up after the BlackBear tune.

MyLS1Hauls

iTrader: (2)

I only noticed an increase in mileage on E85, since GM has the timing so low in the ethanol tables. I didn't see anything noticeable with gasoline.

shaw_426hemi

I got a comparison with preheaders and catback to post headers and catback. I got 19.0 MPG at 65mph with my truck with stock exhaust. With the new ARH 1 7/8" headers with cats and 4 inch mandrel exhaust I got 20.1 mpg on my last road trip at the same 65mph. Both trips were with A/C off and windows up and roughly same tempature/ humidity and elevation.

NKPPhil

You must have a higher level of self-restraint than I do ...

rjwz28

it was a while before I saw some really nice mileage gains due to having too much fun, but I was goofing around a lot before so there was still an improvement.

BigBronBrizzle

I average about 10mpg with my cam and 3000 stall. But thats because I'm having fun with it

BigBronBrizzle

Forgot to mention thats in my 99 single cab. My 2007 NNBS CCSB 6.0 ive squeezed 18.9 going out to vegas on 91 octane and keeping it at 60mpg. 35" tires. 4.10 gears

ak2007r6

iTrader: (1)

Does your standard cab have a 6.2 in it?? I am confused


edit.

either way your NNBS is a 6.0........LOL