87 or 93 octane?

[guruerror]

After the Performance tune the truck definitely 'felt' like it was snappier and had a bit more umph in the acceleration. I say 'felt' because I've never had the truck dyno'ed to document.

The stiffer shift pressure definitely feels much nicer than the stock setting.

MPG changes that are specific to the tune would be hard to say...I made several mods all at once (larger tires, lower gears, exhaust, and headers; then the tune two weeks later)...what I can say: after all that I still get 11.5 (which is exactly what I was getting before).

[HUMTECH]

If you are gonna run a 93 octane tune it will advance your spark timing. It calls for higher octane fuel due to its resistance to burn. If you advance the spark timing you want to slow the burn, thats what higher octane will do. You can run 87 but if you hear "ping" or detonation you should bump up to a higher octane reading

[MARKCORE]

Originally Posted by HUMTECH

If you are gonna run a 93 octane tune it will advance your spark timing. It calls for higher octane fuel due to its resistance to burn. If you advance the spark timing you want to slow the burn, thats what higher octane will do. You can run 87 but if you hear "ping" or detonation you should bump up to a higher octane reading

Beat me to it.

[eddiemcnally]

So then if I program the settings for premium, then it will be perfectly fine! No problems?

Thanx guys

Eddie

[HUMTECH]

You can run 93 octane on it stock, wont give you any gains but wont hurt either. Just dont see the sense spending the extra money unless your tune or a bumped cylinder charge/compression due to forced induction requires it