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[Jackpine]

Originally Posted by not you

Ok ok I will write in sentences, my wife yells at me too for that also . U will have to bare with me with spelling. You stated that if I run 89 octane on 87 tune (meaning the 87tow tune?)I can advance my timing myself on custom tunes. How hard is that to do step by step or harder and what kind of mpg do u get .One more thing my truck is a flex fuel truck but never use that e85 its not around here does that matter. thanks again Shawn

That's better, I kind of get lost in a sentence that spans five lines and as many thoughts!

Both Level 1 and Level 2 are written for 87 octane. In the Custom Options menu, you simply scroll to "Timing" and then hit the "up arrow" until you see +1.0. That's really all there is to it. And yes, Level 2 is the "tow" tune.

The whole point of Custom Options is to allow YOU to make small adjustments in a tune. Nothing too major.

I can't give you a "final" figure for mpg, because our trucks are different. Bill's custom tunes easily improved the economy by 0.5 mpg over the canned tunes. The canned tunes probably gave me an improvement of at least 1 mpg, maybe 2 mpg over stock.

You don't have to run E85 at all. If you do, you'll probably see a big drop in gas mileage, but you may see an increase in power during heavy acceleration.
When you get custom tunes, tell Bill that you are not going to use E85.

All this will probably make more sense when you get your Gryphon. Be sure to read the manual!

- Jack