Ato

So currently I have a 87 tune from Tillman Speed loaded but I want to move up to the 93. I used the 87 tune this week for the gas that was left in the tank, I just filled up with 93 with the onboard computer listing about 39 miles to empty before hand. Do you guys think I'm good to go or do I still risk pinging and detination?

5SPD07GT

you will be fine imo

Nuke

You're good to go. The PCM can adjust to that very minor (if any) octane difference.

acascianelli

You're OK, flash away...

I think people are too concerned about running their tanks of lower octane fuel to the absolute minimum before flashing to a higher octane tune.

CutterWolf

You should be good to go but if you want to be extra careful just wait till you run it down to about a half tank, fill it up and then flash it.

Mach

I was bored one day so I romped around town and got down to 4 miles to empty :P

acascianelli

I've had it say 0 miles to empty. It's not good to do that, and I'll never do it again.

flg2010

How big of a performance gain will you get going from an 87 to a 93 tune...

And using the right gas..