Rick,
The Chevron white Pump Gas here was 105 octane and that was what the book for the 69 Cobra recommended. When they went to this no lead, low octane, I had to have the pistons changed to lower the compression to 10.5 and if I just drive it down the road and don't pull hard, it does ok, but I still buy the 110 leaded racing gas for it. I drove it over to the Finishline place a month ago and it now has 42, 281 miles on it. I could have the heads changed to good aluminum, ones which would make it run better on pump gas as they would dissipate the heat better, but I wanted to keep the iron 427 heads it came with, and since I don't drive it over 300 miles per year I don't have to buy much gas for it.
Gunner and all the rest, thanks for your answers. I have gotten a couple of tanks of bad gas at some of the local mini marts and so have other people around here, yet they do a huge business because of their cheap prices. I will stick with the Valero and other name brands as I don't drive a lot any more. I believe my total for all of last year on the Comet was around 3700 miles
Ron
