Which is better - 90 octane no ethanol or 93 octane 10% ethanol

Great info!

I made it out today to get some 90 octane, non ethanol. I had the car near empty for towing it to Georgia. I pumped in 6.5 gallons since it was such a PITA. The pumps are new and pump much too fast for the a-body!

Price was $3.05/gal using my debit card. Some stations still have a cash price and charge price here, and Valero is one of them...go figure! I'll check the cash price next time I'm there.

93 Octane with up to 10% ethanol is running $2.57/gal at the stations with the same price, cash or card.

I wasn't getting detonation using 93 with ethanol. I'm at about 14* initial and 36* mechanical timing with a 273 Commando.

I'll run this for awhile and see how it runs. Thanks for the input!

Toad