91 ethanol free or 93 w/10% ethanol

[7DCUDA383A]

Opinions are welcome , I have a Phillips with EO 91 about 10 miles away or BP with 93 but 10% ethanol 3 miles away , driving to get gas isn't a problem just wondering what people use , I have a 383 TF with a mild cam and an Edelbrock .

 

[KlsCuda]

I've had that debate with myself often. I tend to get the non-ethanol and fill the tank before I put the car away for winter storage. the non-ethanol gas should last longer.

but for daily driving I've used both and didn't notice a difference in performance, pinging, etc. so i'd also be curious what others think/have experienced

I'm running a 440 - 6 pack mild build - Tremec 5 speed.

 

[sixpactogo]

Well.........We all know what opinions are good for but you asked. My experience with ethanol over the years has taught me that anything with a carburetor does not get ethanol laced gas ever. Fuel injection handles it fine. Ethanol ate up the accelerator pump on two of my carbureted cars and ate up the plastic fuel line on my lawn mower and weed whacker. That said, I quit allowing ethanol in anything other than fuel injected vehicles and have had zero problems since.
The 6.1 in my 68 Charger is fuel injected but I still run the non ethanol in it.

 

[Supernaut]

Ethanol helps "create" gasoline octane rating. In my experience, the ethanol has likely boiled out of the pump's 91+ underground tank while sitting there so who knows what you're left with? I daily run a high compression sbc in my 55 Chevy and just buy 87 with bottle of Lucas octane booster. IMO, any high octane pump gas is a waste of money.

 

[pschlosser]

I concur ethanol is hard on vintage carburetor engine parts. I've see this year, over year, in my 1980s Yamaha Scooter hobby, as well as most muscle cars before the 1990s. Storage, too, seems to be poor with ethanol fuels. I have to rebuild scooter carbs every 3-5 years, and there is often the same powdery residue left behind. Despite using decent fuel filters.

Sadly, I live in California, where people and legislation is uppity. You don't really get much choice, out here. If they did, I would avoid ethanol fuels in older vehicles.