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Old 06-30-2013, 03:40 AM   #61
Pantah
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Quote:
Originally Posted by JimVonBaden View Post
Unless you drive them hard it should work the other way around. The higher octane gas just prevents pinging in high performance motors.

http://mn.gov/commerce/weights-and-m...ctaneFacts.pdf

Jim
I dunno what to tell you, but my Subie Turbo gets about 23mpg on 87 and about 25 on 93. That is cruising sea level at 70mph. My KTM 690 seems to get about the same no matter what is in it. My old 950 got about 37mpg on 87 and 41 on 93. None of my motors ping, but the 950 would get piston rattle if I let it get below 3500 rpm in 5th or sixth gear.

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Old 06-30-2013, 03:56 AM   #62
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my old 1990 e 34 535 only required 91 octane(RON) it ran slightly nicer and got better mileage on 95.Was very slightly cheaper to run the 91
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Old 07-19-2013, 01:39 PM   #63
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Wicked Or find a Station with separate hoses per octane level?

Quote:
Originally Posted by BanjoBoy View Post
^this^
I do use 92 octane.. the cost difference is what? 50-90Cents per tank full? Even on the Adventure.. it's nothing..! Why would you not use 92? Usually Chevron and Shell Stations have pumps with a separate hose and dispenser for each octane grade.. so you know that whatever is left in the hose is the correct grade ;)
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Old 07-19-2013, 04:02 PM   #64
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I stand by the fact that you need to get to know your station. If the operator is the type that loads the premium tank when prices drop, that fuel could be sitting in there for quite a while.
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Old 07-19-2013, 05:03 PM   #65
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Quote:
Originally Posted by advNZer? View Post
my old 1990 e 34 535 only required 91 octane(RON) it ran slightly nicer and got better mileage on 95.Was very slightly cheaper to run the 91
This makes me miss my M30 powered E34. What a sweet motor.
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Old 07-19-2013, 05:12 PM   #66
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Originally Posted by Benesesso View Post
No, it wasn't his and it wasn't mine either. I simply found the pic on the 'net. That can happen with prolonged detonation caused by, among other thinks, using gas with too low an octane rating.

We were just having a bit of fun here. You should join us down in the Jo Momma section. It's like a bar where we can have a nice chat while looking at some nice girls.
You have REAL girls down there ? You've CHECKED, right ?
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Old 07-19-2013, 05:15 PM   #67
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Originally Posted by Benesesso View Post
Just let the first 1/2 gal. go on the ground, then fill up. Don't screw around, you want straight 91 or not?

It needed more ethanol.
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Old 07-19-2013, 05:38 PM   #68
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cant you just go to a gas station that has a different handle for each octane? i do
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Old 07-19-2013, 05:48 PM   #69
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I only use premium because it's liquid horsepower








































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Old 07-19-2013, 06:00 PM   #70
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Quote:
Originally Posted by rapidoxidationman View Post
The capacity of a 100-foot length of 1-inch diameter hose is 4 gallons.
How much line is between the nozzle and the pump's switching valve?
gas pump hose is 3/4" id, there is .00229 gallons per foot of hose


there may be .3 or .4 gallons residual in a 4 gallon fill up, that might knock the 91 octane rating down to 90.8, hardly anything to worry about
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Old 07-19-2013, 06:04 PM   #71
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Originally Posted by DirtyOldMan View Post
I just pump a quart or two out on the ground.
and I hope you get caught
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Old 07-19-2013, 06:04 PM   #72
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Originally Posted by *Gmoney* View Post
I love old school thinking!


That piston needs a headstone,
Here lies a 91 octane
fed 87 in the hose
Not really...
Quote:
3.0L Race Motor Piston from my HorsepowerFreaks Supra. (32psi of boost @ 17.5:1 A:F ratio for 3 seconds)
http://www.e90post.com/forums/showthread.php?p=8652
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Old 07-21-2013, 03:30 AM   #73
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Some stations blend mid-grade from two tanks, some stations have a dedicated tank for it. I believe I remember someone saying the hose on a single-hose system contains no more than a quart. Unless you are buying miniscule amounts of fuel you should never notice the difference.

My 1100GS supposedly needs premium and does not adjust for anything else. When I first got it, it would occasionally ping in hot weather even on Premium. Ever since I made a point of bouncing it off the rev liimiter at least once on every ride, I can get away with Regular most of the time. At worst, I get a minute amount of pinging during full throttle acceleration at mid rpm.

Back in the 80's, I had a small, high performance (German) car that, when tuned for optimal performance, would ping occasionally on any high octane fuel. Unleaded was just becoming available in the UK at the time and I found that when I mixed high octane leaded and high octane unleaded, it wouldn't ping at all. Not an option these days of course.

My 20-year-old Yamaha GTS requires 87 octane and the owner's manual states that up to 10% ethanol is ok. I don't recall seeing ethanol blended fuels back then but as I ride it freuently enough to avoid the fuel getting stale, I don't worry too much about what goes into it (but not "budget", no-name fuel unless I know I'll be running the tank out and fueling up again the same day)
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Old 07-21-2013, 08:13 AM   #74
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Quote:
Originally Posted by Manuelsv View Post
I do use 92 octane.. the cost difference is what? 50-90Cents per tank full? Even on the Adventure.. it's nothing..! Why would you not use 92? Usually Chevron and Shell Stations have pumps with a separate hose and dispenser for each octane grade.. so you know that whatever is left in the hose is the correct grade ;)
I lives in the golden state, where all pumps iz single hose, 'n since gas iz usually over $4 a gallon 'round these parts, so most sheeple use regular. (87)
Now I'm too simple ta do the math, butt if'n mah bike getz 'round 40 mpg, 'n if'n I ride 20k mi. a year, 'n if'n when ya buy 92, yer get'in .7 gallons of 87, (Butt pay'in fer 92) 'n if'n yer bike runs just fine on 87, seems ta me only a chump would piss money away on the "good stuff?"
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Old 07-21-2013, 09:04 AM   #75
Barnone
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I've been testing the gasoline for ethanol content and have found that the premium fuel in my location (Robbinsville,NC) is ethanol free and the regular grade has 10% ethanol.

So far I have tested four different gas stations and since our fuel probably comes from the same tank farm that explains the results of my testing.

As an aside the one station that advertises ethanol free premium gets 10 cents more a gallon and the bikers line up here to get it.

Regular is about $3.60 and premium about $3.90 so the question is that since ethanol is about 70% energy of pure gas, maybe it is just about a wash in cost per MPG so why not run premium?
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