Got gas AT BJ's Wholesale club. They were out of regular so they were selling Premium 93 octane for the same price as regular. i didn't think about it i thought great premium for the price of regular, why not. it took 11 gallons. My question at 4,000 miles am i doing any harm? i hope not.

No. and it was probably diluted a bit from what you had remaining in the tank.
Wish I could have managed to get the porsche there!
se

Will not hurt your engine a bit. Premium gas contains additives to avoid early detonation (unwanted) on high compression engines. For this engine, will make no practical difference.

No. and it was probably diluted a bit from what you had remaining in the tank.
Wish I could have managed to get the porsche there!
se

$3.77/gal lol

$4.18 for 93 octane in Cardiff by the Sea.

wonders. you reset your ecu after minor mods. and on recalibration it used knock readings etc at idle...

if you fueled up pure tank non diluted say 93 octane or 94 and reset your ecu.

will it prove to be an improvement? both in performance and maybe mpg?

if not on pre maf elements what about with maf?

7.99 for 101 octane at a gas station in phoenix

9.99$ for cam2 in ny gas stations by me