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post #1 of 19 (permalink) Old 02-26-2011, 04:11 PM Thread Starter
 
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Fuel

I am wondering what octane you guys are running in your cars. I am especially interested in what octane you are running if you have mainly stock engines. Also, do you guys use any fuel additives?

Thanks!
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post #2 of 19 (permalink) Old 02-26-2011, 07:04 PM
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Garage
I run Sunoco 93 Oct. (stock)No additives now but when the 15% garbage gas takes effect I will be using additives to help reduce the damage this Chit will do to it.

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post #3 of 19 (permalink) Old 02-27-2011, 09:10 AM
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Highest octane you can find at the pump...... In my neck of the woods, that's 91.



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post #4 of 19 (permalink) Old 02-27-2011, 11:02 AM
 
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I was using Sunoco 93...with a little 100LL for safety! 1967 400...



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post #5 of 19 (permalink) Old 02-27-2011, 11:30 AM
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91 octane is the highest I can get at regular gas stations, mixed with race gas (110 octane) or booster in my '65 GTO (stock compression or a little higher), and the cheapest slop I can get in my '67 GTO that I set at 9:1 compression. My buddy with a freshly restored, stock '67 GTO is running the 110 too, but at a higher ratio than I am. My '65 seems to be ok at about what I estimate to be 98 octane. Mainly because it's hot and dry out here. If it were cooler or more humid, I think a little less octane would be ok. Quite a few guys in colder climates where 93 octane is available seem to be ok with stock-ish compression. Doesn't work in CA.
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post #6 of 19 (permalink) Old 02-27-2011, 11:38 AM
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Quote:
Originally Posted by dahd11 View Post
I am wondering what octane you guys are running in your cars. I am especially interested in what octane you are running if you have mainly stock engines. Also, do you guys use any fuel additives?

Thanks!
I built my motor intentionally to be happy on 93 octane, but it's not stock. My static compression ratio is 9.46:1 and I'm running "factory" iron heads.

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post #7 of 19 (permalink) Old 02-27-2011, 11:40 AM
 
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I run 93 Octane, which is highest I can get in the Houston area. So far I haven't used any additives, but I haven't driven the GTO in hot summer weather either (been gone all summer).
I use ExxonMobil gas exclusively, mainly because I work for ExxonMobil, but also because the gas seems to last longer than the Valero gas I used to buy (closest place to the house). My Corvette is particularly sensitive to old gas, and the Valero stuff would make it start to run poorly after just a couple of weeks. I also started putting StaBil in the tanks if I'm going to be gone or not driving the cars for a while for whatever reason. They (StaBil) make a new formulation that is supposed to help with the higher alcohol content fuels that are being sold these days.

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post #8 of 19 (permalink) Old 02-27-2011, 05:03 PM
 
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I use shell 93 octane with Lucas oil fuel treatment (upper cylinder lubricant & fuel system cleaner). It replaces the lubricating properties that were stripped from gasoline when they removed the lead.

I'm from New England so in the off season when I'm not driving the car I stabilize the gas with K100-MG which I've used for years in my boat and it is by far the best stabilizer available but very expensive compared to others. I use the MG(marine gas) instead of the G(gas) because it has even a more advance stabilizer and prevents ethanol phase separation.
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post #9 of 19 (permalink) Old 02-27-2011, 05:20 PM
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How about avaition fuel?
100 LL?
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post #10 of 19 (permalink) Old 02-27-2011, 09:05 PM
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Topkat, if you can get it and it's affordable, 100LL avgas will work like a champ in your '67.
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