Quote:
Originally Posted by John 070
Quote:
Originally Posted by Legion5
The higher the octane number, the less gas there actually is in your gas,
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wow
Granted, if your car is designed for 87, and you put 93 in the tank, you're burning $$$ out the tailpipe. But 93 in a 335 does not reduce performance. |
I know most ecu aftermarket tunes are octane specific, if you use 93 they will tune to 93, if you use 91 they will tune to 91. In such case using 93 has benefit over 91 because they can tune it more aggressively for you.
We only have 91 in Norcal. Recently Costco started to put "10% ethanol" labels on their pumps, I asked a manager he said it was for the 87 only. Hopefully he was correct because ethanol not only reduces the octane rating, it may cause other problems.