I always heard a rumor that if you get mid-grade or higher gas a "older" style motor(4.0) will run better because it has less ethanol in it. Is this true?
'16 JK Sport
-2.5" TF Spring Lift
-315 BFG A/T
depends on where you live and what the gas station sells. check at the station and ask or look at the pumps. most pumps say"may contain 10% ethanol" or"no ethanol". short term you are probably ok, but ethanol can do damage to engines.
This is something you need to look into but some companies use ethanol & methanol based compounds (ETBE, MTBE) to increase octane. Higher octane fuel, if not specifically required will yield no benefits, and probably contains more ethanol than a lower octane fuel from the same batch. A batch of gasoline is all equal until specific additives are blended to control the octane level.
Back in Iowa where I'm from a lot of gas stations sell ethanol free gasoline. The non ethanol is 87 Octane and would almost always be .10 more than the ethanol which was 89 octane. I would always use the non ethanol even though it cost slightly more because I would get 17-18 mpg on the highway and would get 14-15 on the highway running the ethanol blend. The Jeep ran the same on both types of fuel but I saved money in the long run with the non ethanol plus I wouldn't have to fill up as often.
Originally Posted by Nick05 View Post
There are a number of reasons ethanol sucks but engine damage isn't one of them.
although small amounts of ethanol may be okay, i wouldn't say it wouldn't hurt. if that was the case you could put the flex fuel in any vehicle and be ok and the warranty on your boat wouldn't be voided if they found it in your gas tank. you can always ask the people who work on lawn mowers and trimmers for what it does on those and try and figure out how long it would take to do it to yours. most places sell e10 which is 10% volume ethanol. that means if the tank they fill(in the ground, not your tank) is 1000 gallons, 100 gallons is straight ethanol. if you really are still curious, look into how they make ethanol and you might figure out why sometimes after you gas up, your jeep doesn't want to start of runs funny for a while.
Originally Posted by Nick05
If you want an argument against ethanol argue the economics of it. Or of course the lower energy density compared gasoline. As a performance fuel though pure ethanol is better because of its high octane properties.
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