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Joined: Dec 2021
Posts: 3,595 Likes: 6
Campfire Tracker
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Campfire Tracker
Joined: Dec 2021
Posts: 3,595 Likes: 6 |
The "non-ethanol" is getting harder and harder to locate. Won't run that alcohol crap in any of my gasoline engines! I can go further on non-ethanol than on the 10% ethanol. Dollar for dollar, the mileage is about the same "price/mile", I just get more miles and better performance with the non-ethanol.
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Joined: Jan 2006
Posts: 69,520 Likes: 24
Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2006
Posts: 69,520 Likes: 24 |
Non-al is too expensive here. I run it in all my small engines. I've tried it in the car but the increase in mileage doesn't even come close to offsetting the high price.
“In a time of deceit telling the truth is a revolutionary act.” ― George Orwell
It's not over when you lose. It's over when you quit.
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Joined: Jan 2020
Posts: 1,034 Likes: 3
Campfire Regular
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Campfire Regular
Joined: Jan 2020
Posts: 1,034 Likes: 3 |
I just bought a 2022 big motor SUV that weighs around 6500 # , it has a 6.4 hemi that has 475 horsepower, this thing is nothing but a computer on wheels, with a price tag I never dreamed about spending, so why would I hurt motor or sensor’s running cheap gas and pay much more later in repair cost after high dollar warranty runs out.
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Joined: Aug 2001
Posts: 2,893 Likes: 2
Campfire Regular
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Campfire Regular
Joined: Aug 2001
Posts: 2,893 Likes: 2 |
My Summer Car is a 2010 Jaguar, it also required 91 octane, I would always run off the top half of the tank, so I'd fill it with 94 then the next time 89, rounds out to be 91.5. Never once did I run into any engine knock or poor performance.
"The older I get, the better I was"
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Joined: Oct 2005
Posts: 79,321 Likes: 2
Campfire Oracle
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Campfire Oracle
Joined: Oct 2005
Posts: 79,321 Likes: 2 |
High octane gas is 2400. Low octane gas is Unique. High octane gas is required for high compression engines because it give a slower, smoother burn than low octane gas. Low octane gas burns quicker but it hammers a high compression engine around when it ignites.
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Joined: Oct 2005
Posts: 79,321 Likes: 2
Campfire Oracle
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Campfire Oracle
Joined: Oct 2005
Posts: 79,321 Likes: 2 |
The info I see on the Lexus IS250 says that it's running 12:1 compression. Back in the old small block Chevy days if you ran 12:1 pistons a standard starter would hardly crank it over.
I don't know the answer for sure. But I would guess that 87 octane gas would be hard on a 12:1 compression engine.
It would be like pushing a 250 grain bullet to 1400 fps with Unique in a .44 mag.
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Joined: Apr 2001
Posts: 2,166 Likes: 3
Campfire Regular
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Campfire Regular
Joined: Apr 2001
Posts: 2,166 Likes: 3 |
If the engine calls for 91 octane, I'm betting you'll see better fuel mileage with 91 than 87. Maybe not enough to completely offset the price difference. But enough to ease the pain some at the pump. In other words, I bet using 87 in that engine won't save you as much as you think.. THIS I have run the gas mileage test many times. Engines that call for 91 octane get better mileage on 91 octane.
MOLON LABE
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Joined: Dec 2002
Posts: 14,315 Likes: 6
Campfire Outfitter
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Campfire Outfitter
Joined: Dec 2002
Posts: 14,315 Likes: 6 |
I have an Infiniti I30 that requires high octane. I sometimes will run a tank of regular, can't tell much difference. But 95 percent of the time I do use the high octane.
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Joined: Feb 2004
Posts: 46,748
Campfire 'Bwana
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Campfire 'Bwana
Joined: Feb 2004
Posts: 46,748 |
Didn't you crash your lawnmower? This might not be the ride for you.
Camp is where you make it.
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Joined: Sep 2021
Posts: 4,151 Likes: 9
Campfire Tracker
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Campfire Tracker
Joined: Sep 2021
Posts: 4,151 Likes: 9 |
This is a car myth. The reason why engine manufacturers specify high octane is ONLY due to EPA emissions and mileage mandates and nothing more. Modern ECUs can instantaneously retard timing to keep an engine out of detonation.
There are a brazillion YouTube engine dyno tests to prove the point.
A forced induction engine (turbo or supercharger) is another animal all together. Due to high pressure combustion, they need a higher octane. But for an naturally aspirated engine, as long as you don't need that extra 5 horsepower at 5,000 rpm, you nor your engine will notice any difference between 87 and 93 octane. But your wallet will notice the $0.30/gallon difference.
Now, if you compare 87 vs E-85, then there is a lot of performance lost/gained between the two.
Last edited by STRSWilson; 08/08/23.
Si Vis Pacem, Para Bellum
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Joined: Jan 2002
Posts: 12,893 Likes: 5
Campfire Outfitter
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Campfire Outfitter
Joined: Jan 2002
Posts: 12,893 Likes: 5 |
I see about a 16% improvement on my 2.0 Ecoboost with premium, but that is confounded by the fact that around here premium is ethanol free. Well worth the $0.20 premium at Costco.
Sic Semper Tyrannis
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Joined: Jan 2006
Posts: 656
Campfire Regular
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Campfire Regular
Joined: Jan 2006
Posts: 656 |
So, 10K for a lexus with 125,000 seems like a really good deal. Interior torn up or not; if maintained, they run for ever. But, lets run the numbers. An engine repair of $1,500 is 2.5 years of gas price difference. Keep in mind, Lexus are notoriously expensive to repair.
Assuming the $0.40 a gallon less expensive and the $50 a month variance, the annual mileage be between 10,000 - 13,000. So, for purposes of the thread, at 12,000 miles a year and MPG at 25 for premium and 20mpg for regular, the ANNUAL cost variance is less than $40. IF we use the previous comments of 16% as a baseline, yo are looking at less than $100 a year.
I feel certain that there will be $40 in increase damage to the engine.
Last edited by KYFRED; 08/08/23.
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Joined: Sep 2021
Posts: 4,151 Likes: 9
Campfire Tracker
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Campfire Tracker
Joined: Sep 2021
Posts: 4,151 Likes: 9 |
I see about a 16% improvement on my 2.0 Ecoboost with premium, but that is confounded by the fact that around here premium is ethanol free. Well worth the $0.20 premium at Costco. Those that tend to cruise their EcoBoost F-150 on the highway at 75 mph will note that fuel economy was better on 93 octane with the truck turning in 17.6 mpg compared to 17 mpg even on 87 octane.
Si Vis Pacem, Para Bellum
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Joined: Nov 2006
Posts: 10,835 Likes: 3
Campfire Outfitter
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Campfire Outfitter
Joined: Nov 2006
Posts: 10,835 Likes: 3 |
Sometime back in the 90's, my brother had just bought an Audi A-4 or A-6 or some such, don't remember exactly. Soon afterward, he and I went on a road trip to Florida. He hadn't, at this point, driven the car extended distances at high speed. At some point, when I was driving, I noticed the temp gage climbing up there. Also, when we went to shut down, it would start dieseling a bit. He asked me what the problem was (my brother knows nothing about such things.) I asked what fuel he was buying. Answer was, "regular." I told him I don't claim to be an expert at this stuff, but I suspected that, in order to run on the regular, his engine system was retarding the timing a lot and, for some reason, ignition at that part of the cycle generated more heat than the cooling system could handle, thus the overheating and, with the overheating, the dieseling. Next fill up, he got hi test and the problem was solved. He later told me he went to his mechanic when we got home. I asked what he told him. "Some of that same stuff you said, about the timing and stuff."
I've also seen inboard/outboard boat engines that you couldn't get to shut down after running them hard until after they'd cooled down a little. Problem would go away with higher octane.
Mathew 22: 37-39
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Joined: Oct 2009
Posts: 12,639 Likes: 10
Campfire Outfitter
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Campfire Outfitter
Joined: Oct 2009
Posts: 12,639 Likes: 10 |
You can count on the engine ta detect and stop detonation.
*After* there's been detonation.
Ain't no "this things bout ta knock" sensor.
Just use E20, increased octane and performance and cheaper.
If it ain't available premixed, mix it at the pump.
2 gallons of E85 ta 14 gallons of 87, and ya got your 91, and cheaper.
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Joined: Jan 2010
Posts: 23,583 Likes: 3
Campfire Ranger
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OP
Campfire Ranger
Joined: Jan 2010
Posts: 23,583 Likes: 3 |
Didn't you crash your lawnmower? This might not be the ride for you. wrong guy, I bought the hunnert dollar lawnmower, but never crashed one
have you paid your dues, can you moan the blues, can you bend them guitar strings
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Joined: Jan 2001
Posts: 30,961 Likes: 22
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jan 2001
Posts: 30,961 Likes: 22 |
Elevation vs octane Here...GX 460 'requires' 91 oct Rural Utah is at 6K' and up from here Clear (eth free..readily available) 88 octane Reg is 85 88 runs the GX great & delivers 20-21 mpg Clear was $4.35/gallon last purchase Oh yea......FJB https://www.mikeshawsubaru.com/service/information/gas-octane-at-altitude.htm
T R U M P W O N !
U L T R A M A G A !
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Joined: May 2011
Posts: 5,808 Likes: 2
Campfire Tracker
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Campfire Tracker
Joined: May 2011
Posts: 5,808 Likes: 2 |
Is it possible to re-tune the engine to run with a lower octane fuel? With direct injection it may be possible. You'd have to lower the compression ratio, but that would change engine performance, and defeat the purpose.
Whatever you said...everyone knows you are a lying jerk. That's a bold assertion. Point out where you think I lied. Well?
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Joined: Dec 2008
Posts: 8,334 Likes: 3
Campfire Outfitter
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Campfire Outfitter
Joined: Dec 2008
Posts: 8,334 Likes: 3 |
If an extra $5 a tank is a big deal to you don’t buy it.
"Life is tough, even tougher if your stupid" John Wayne
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Joined: Jan 2006
Posts: 69,520 Likes: 24
Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2006
Posts: 69,520 Likes: 24 |
I see about a 16% improvement on my 2.0 Ecoboost with premium, but that is confounded by the fact that around here premium is ethanol free. Well worth the $0.20 premium at Costco. Is Costco non-al everywhere? I'd love to pay their prices for my small engine gas instead of the high priced other game in town.
“In a time of deceit telling the truth is a revolutionary act.” ― George Orwell
It's not over when you lose. It's over when you quit.
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