 Fuel?
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Joined: May 2007
Posts: 482
Adjunct
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OP
Adjunct
Joined: May 2007
Posts: 482 |
Thinking about the different grades of fuel... If the last person to use the pump got 87 octane and you pull up and pump 91 octane; how much 87 octane is left in the system before the 91 octane is dispensed? I think I'm getting ripped off trying to run premium. 
George
Freelance Observer
07 BA with 605's, engine dresser bars, and cheap saddle bags.
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Re: Fuel?
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Joined: Aug 2007
Posts: 10,736 Likes: 8
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,736 Likes: 8 |
Quote:
If the last person to use the pump got 87 octane and you pull up and pump 91 octane; how much 87 octane is left in the system before the 91 octane is dispensed?
Probably not enough to worry about. The way I see it, premium fuel is about 60-80 cents more per tank than the cheap stuff, what's the big deal? You could always look for a pump that dispensed premium on its last use, but really, what's the point?
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: Fuel?
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Joined: Aug 2008
Posts: 1,048
Learned Hand
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Learned Hand
Joined: Aug 2008
Posts: 1,048 |
Interesting question.
10 feet of hose, 1" diameter, equals 94.25"^3.
94.25/231 = .40 gallons before you hit premium.
2.5 per gallon versus 2.2 per gallon = .30cents difference
.30dollars x .40 gallons. equals a .12 dollars or a 12cents ripoff per fill up.
Assuming I did my math right(second rum and coke)
Clay
PS I made several assumptions, but you get the idea.
Last edited by frijoli; 06/06/2009 9:52 PM.
01010100 01110010 01101001 01110101 01101101 01110000 01101000 <3
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Re: Fuel?
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Joined: Oct 2008
Posts: 2,420
Oil Expert
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Oil Expert
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We've had a lot of fuel threads on here and i think you'll find that many will say your wasting your money on highest grade gas b/c it burns slower and you're not burning fuel at it's optimum level. You should use whatever grade is the lowest but does not cause any pinging, etc...
Others will say the highest grade produces more horses and burns like crazy, would never use anything else.
In my honest opinion...I use midgrade(89 to 91). If it doesn't cause problems, the bike runs great, and saves me money, I don't see a problem with THAT. Why spend more?
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Re: Fuel?
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Joined: Apr 2009
Posts: 497
Adjunct
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Adjunct
Joined: Apr 2009
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My understanding is, the line that extends from the pump to the nozzle
feeds from overhead to prevent fuel from sitting in the lines. Thus a fresh
squeeze pumps fuel up a long shaft and then down the flexible tube
to the dispense nozzle. Once the pump stops the gasoline runs in two
directions, one from the dispense to the nozzle, and the other from the
long feed tube back to the underground storage tanks. The issue is not
people pumping the wrong grade gasoline for as few seconds, but the
gasoline sitting in those pipes vaporizing and leaving a volatile
situation should a fluke spark ignite it.
Last edited by Rev; 06/06/2009 10:10 PM.
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Re: Fuel?
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Joined: Mar 2008
Posts: 1,586 Likes: 1
Learned Hand
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Learned Hand
Joined: Mar 2008
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Re: Fuel?
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Joined: Aug 2008
Posts: 1,048
Learned Hand
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Learned Hand
Joined: Aug 2008
Posts: 1,048 |
Quote:
We've had a lot of fuel threads on here and i think you'll find that many will say your wasting your money on highest grade gas b/c it burns slower and you're not burning fuel at it's optimum level. You should use whatever grade is the lowest but does not cause any pinging, etc...
Others will say the highest grade produces more horses and burns like crazy, would never use anything else.
In my honest opinion...I use midgrade(89 to 91). If it doesn't cause problems, the bike runs great, and saves me money, I don't see a problem with THAT. Why spend more?
Using the lowest grade that works without detonation,is best as far as efficiency goes. HP is included in this.
Clay
01010100 01110010 01101001 01110101 01101101 01110000 01101000 <3
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Re: Fuel?
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Joined: May 2007
Posts: 126
Adjunct
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Adjunct
Joined: May 2007
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Triumph says use 89 so thats what i do, speaking of gas its almost $3 a gallon again! 
03 Speedmaster
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Re: Fuel?
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Joined: May 2006
Posts: 3,971
Loquacious
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Loquacious
Joined: May 2006
Posts: 3,971 |
Quote:
Interesting question.
10 feet of hose, 1" diameter, equals 94.25"^3.
94.25/231 = .40 gallons before you hit premium.
2.5 per gallon versus 2.2 per gallon = .30cents difference
.30dollars x .40 gallons. equals a .12 dollars or a 12cents ripoff per fill up.
Assuming I did my math right(second rum and coke)
Clay
PS I made several assumptions, but you get the idea.
Excellent math throw down, & waaaay over my cipherin' head, but...
Gas hose is coaxial for vapor recovery. I'd have to go check, but the ID of product portion of the hose is probably closer to, 3/4" ?
Sorry - couldn't help myself
More gasoline fun facts - most underground storage tanks have a wee bit of water in them. It's managed and isn't a problem 99.9% of the time. When the gas delivery tankers dump their loads, I wonder if they don't stir the tanks a bit. I have a superstition about buying gas when I see a delivery in progress. I could well be wrong.
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Re: Fuel?
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Joined: Aug 2007
Posts: 517
Adjunct
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No, you are correct. best to let the fuel sit a bit and it'll stratify. As for octane, there is no benefit to using higher than a engine needs-and most likely performance will suffer if it's higher than the design spec. There are about 1mm papers on this topic and a bit of internet fun at the big oil sites will "learn you" a bunch of fun and useless facts.
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Re: Fuel?
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Joined: Jan 2005
Posts: 5,590
Check Pants
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Check Pants
Joined: Jan 2005
Posts: 5,590 |
Quote:
Thinking about the different grades of fuel...
87 or 91 Octane is always preferred to gas from the Green Handled pump.
I red about that on the internet.
jh
"It's not what I say that's important, it's what you hear" Red Auerbach
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Re: Fuel?
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Joined: Jan 2005
Posts: 2,240
Oil Expert
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Oil Expert
Joined: Jan 2005
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Quote:
Triumph says use 89 so thats what i do, speaking of gas its almost $3 a gallon again!
That's what my owner's manual says, so that's all I ever buy. From "quality" gas stations, of course. (Shell, Chevron, maybe Exxon or Valero in a pinch)
It amazes me how people driving Mercedes, Lexus, Jaguar, etc., can have no concern over stopping and filling up at no-name "Stop-N-Robs"....two pumps in front of the neighborhood cigarrette store....to me, that's not a fuel stop.
Keith
Houston
Ridin'Texas
'04 Speedmaster
AI removed, Pingle, UNI Filter, 1 shim, straight-through slash-cut TORs, Stage 1 DynaJet, 140 mains, 3 turns, 16/42 final drive, 115K
2020 T120 Black
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Re: Fuel?
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Joined: Apr 2009
Posts: 497
Adjunct
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Adjunct
Joined: Apr 2009
Posts: 497 |
Quote:
It amazes me how people driving Mercedes, Lexus, Jaguar, etc., can
have no concern over stopping and filling up at no-name "Stop-N-Robs"....
two pumps in front of the neighborhood cigarrette store....to me,
that's not a fuel stop.
Considering that most if not all of our gasoline comes from one of three
or four refineries, why should it matter which station you buy the fuel
from? It is all the same product sold under a different brand.
If there's nothing wrong with me,
maybe there's something wrong with the universe!
-Dr. Crusher
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