Does everyone use premium gas with the turbo? - Page 5 - TerrainForum.net: GMC Terrain Forum
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post #41 of 50 (permalink) Old 08-29-2019, 11:50 PM
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What about using 100% gas, we have easy access to it here in the South..
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post #42 of 50 (permalink) Old 09-11-2019, 07:20 PM
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Octane might actually be lower w/o ethanol for the same grade of gas? I hate to spend the money on premium but high compression, direct injection, turbo charging and small displacement add up to the need for it. I suppose the knock sensor will retard timing enough to protect the engine if 87 octane is used but I'd rather not rely on that system unless I have to. I make up for it by buying cheap wax for the paint instead of the 30 dollar a bottle magic wax.
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post #43 of 50 (permalink) Old 09-11-2019, 10:13 PM
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I understand your point. I read on the Corvette forum that using 100% (87) gas is actually higher rating than 89 E-10 gas..
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post #44 of 50 (permalink) Old 09-11-2019, 10:25 PM
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The higher the ethanol content, the higher the octane. The octane rating for E15 (15% ethanol) is 88 octane and E85 (85% ethanol) is 108 octane. Straight ethanol has an octane rating of 113 I believe
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post #45 of 50 (permalink) Old 09-11-2019, 11:13 PM
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Guess I'm just NOT a fan of ethanol because of what it does to small engines.
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post #46 of 50 (permalink) Old 09-12-2019, 01:03 AM
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Neither am I .... I can't stand the stuff but we're stuck with it. I have five gallon cans with non ethanol "rec" fuel for the lawnmower, chainsaw, leaf blowers etc. Around here, ethanol free gasoline is pretty expensive. The terrain is a daily driver so the ethanol laced fuel doesn't have time to go bad which I'm told can happen in just a few months.
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post #47 of 50 (permalink) Old 09-12-2019, 09:31 PM
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Around here 100% gas is priced good, so I use it a lot.

I've repaired friends Harleys' from the damages of ethanol to their carbs & rubber gas lines etc..
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post #48 of 50 (permalink) Old 11-22-2019, 10:29 PM
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Yeah, I am firmly in the no ethanol camp with my lawn mower, portable gen set, and other small engine stuff. But I am firmly in the ethanol camp with my vehicles. I primarily have used E85 but have recently moved to doing the E30 thing. Many in the performance community will mix E85 with E10 at a 1 to 4 ratio, or E85 and E0 at a 1 to 3 ratio and use it even in their non flex fuel performance cars. With very good results. No codes thrown and no engine or fuel issues. All the current crop of cars and trucks are made for E15 anyway and have to account for variations.

E30 has a 92-93 octane rating. Even if E85 is not significantly cheaper than E10, a mix of the two would be lower than E10 alone. Fuel that is cheaper than E10 and delivers premium octane performance.

All my current vehicles are flex fuel rated. But If I had a non flex fuel high compression or turbo gas engine that requires or could benefit from using premium fuel, I would seriously give the E30 thing a whirl and see how it works out. If it does, then one could have premium fuel performance with regular fuel price. Not sure how anyone could see that as a bad thing.

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post #49 of 50 (permalink) Old 11-22-2019, 10:38 PM
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Quote:
Originally Posted by Enigma View Post
Around here 100% gas is priced good, so I use it a lot.

I've repaired friends Harleys' from the damages of ethanol to their carbs & rubber gas lines etc..
Well, it is an apples to oranges thing. The Harley was never intended for ethanol fuel. Also, it is not a closed fuel system like a modern emissions equipped vehicle, so any moisture could be a problem. Basing what one would do from anecdotal experience with a small engine like a lawn mower, gen set, or a Harley is not really realistic. Folks in my area have been using at least E10 since the late 1970's in their vehicles. There are still plenty of vehicles running around that have been on E10 for 20 years or more. My 1974 Pontiac Catalina got E10 most of its life. The car died of body cancer at 250,000 miles, but that 400 V8 engine was still good. My 2015 2500 and 2017 Nox have been on 100 octane E85 almost exclusively for their entire time since I bought them new. Only recently have I dropped back to E30 as I have found the mpg is significantly better than E85 and not too far off from regular. So I still get premium octane performance at less than regular fuel prices.

Freedom is not the ability to do what you want, but the ability to do what you ought.

2006 Cadillac CTS 3.6
2015 Silverado 2500HD 6.0
2017 Equinox 2.4

Last edited by Copperhead; 11-22-2019 at 10:43 PM.
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post #50 of 50 (permalink) Old 11-24-2019, 11:09 PM
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Well all rightee then..

2008 HHR Panel 2LT, purchased Aug 28, '09 to date. Great lil ride.

Currently studying the Gen 1 Terrain for a possible next ride.
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