I am running 3923's as well. Was warm here today and I tried it a little. No spark knock on 89 tune with 87 gas.

 

Gas is funny- if you can get by with running a hotter tune on lower gas, shoot, go for it. I'd be careful though, and carry the tuner with you in the case you get a batch that's a little under the posted octane.

Hemifever runs his tunes pretty close to the edge, which means he's advanced the timing.. If you're running the hotter tunes on lesser gas your going way close to getting the dreaded ping.

I run the 91 tune on 93 gas for best mileage/performance compromise. Its working out pretty good for me. Don't be afraid to experiment with every option- you may find something that works really well for you that way, like I did.

 

im running 93 on 93 , sucks getting about 220 miles to a 26 gallon tank :/ going too see what i get on this tank .

 

lastrights, have you tried running the 87 or 89 tune and see what your truck does?

 

i have 87 91 and 93 tune, and the other ones just dont compair too the 93 lol i know 93 burns faster wish i could get 87 gas and run 93 .. i could prob get away with it if i had bigger gears because of less strain on the motor for ping. i dunno the mods i have and the lead foot i am , i know ill never have good gas milage and summer is about here and having windows down and my exhaust maes for even worse milage haha

 

i do 87 with 87 i was doing 91 on 87 but i only did it for a day cause i was running 91 with 89-91 gas. and forgot to change the tune when i did 87 gas didnt notice any ping or loss of hp

 

lastrights ive seen ur videos.. would love to see a 0-60 vid come from you. my 87 tune and gas i still run good 0-60 but my 93 tune and gas.. i cant get the proper traction to get a run.. ill goo all the way to 2nd gear before it will catch! im still trying to work out a good way to launch on 93 tune..

 

mine peels out too, but i wait til i get moving some light throttle then i slam it. sometimes it will still break loose but its awesome regardless . sometimes it takes off beteer spiing a lil cause it grabs high in the rpms and goes lol

 

ya i do all mine is 87.. and i do wut you do slow into throttle then slam it.. mine will break loose but stay straight and leave faint marks going down the road but they are light. so its all good as long as shes still moving and aint going sideways! lol my 93 tune i try and stay away from i was getting bad gas millage! mostly cause i cant keep my foot out of it.. with all that unleashed power its very hard! to not wana hit it or drive it like you stole it.. haha.

 

i drive like stole it i dont even care lol its my baby i take care of it and stay maintain. i didnt buy my truck for milage .