LaserGT

I finally got the DiabloSport Predator that I always wanted but I need to pose this question before I download the tune. What's the best (and hopefully cheapest) way to get the 89 octane out of it's system before I starting pumping in the 93 octane juice? Do I just have to run it down to fumes? I don't want anything screwed up...it would kinda ruin my day.

Colorado_Mustang

Run the tank 'til it's low, then fill it with the 93. You should be okay, but you won't reach peak for a couple tanks...

Maverick04GT

The easiest way is to just start running 93 when you order the tuner....but since you've already got it, I'd probably run at least two tanks of 93 through before swapping out the tune.

LaserGT

Thanks much to both...!!