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Old 04-09-2011, 09:34 PM
 
52 posts, read 48,379 times
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Cheaper fuels are being blended with ethanol now, which provides lower MPGs than straight gas. I've done my own tests, and in my vehicle it is cheaper to run the unblended premium.

For small engines or engines that may have to sit for long periods of time between uses, you should avoid ethanol blends entirely because the ethanol holds water which corrodes the carburetor or injector pump.
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Old 04-09-2011, 09:46 PM
 
Location: SE Michigan
6,191 posts, read 14,743,502 times
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I haven't done a comparison in years, but I did it on my old truck for several tanksful. Maybe 5-6 years ago.

Premium fuel definitely yielded somewhat higher mpg, maybe 2-3 mpg. Last time I did the math it did not make premium gas a better deal, though, at 10/c more per gallon. Maybe at today's prices it would make a difference? Arithmetic is not my strong suit.

When I last had a high-performance car that, according to the dealer and the manual, needed hi-test, that is what I used and there was absolutely a difference.
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Old 04-09-2011, 11:37 PM
 
Location: un peu près de Chicago
773 posts, read 2,005,411 times
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Quote:
Originally Posted by 415_s2k View Post
I had an ex-fiance ...
If she is female, she gets two "e"s. MALE: fiancé; FEMALE: fiancée (pronounced the same). You would not want to be caught in a Parisian boudoir speaking bad French, would you? Not me.
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Old 04-09-2011, 11:42 PM
 
Location: Guangzhou, China
9,620 posts, read 12,804,020 times
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Quote:
Originally Posted by Zea mays View Post
If she is female, she gets two "e"s. MALE: fiancé; FEMALE: fiancée (pronounced the same). You would not want to be caught in a Parisian boudoir speaking bad French, would you? Not me.
No. But fortunately, I'm in America and have no immediate plans to visit France
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Old 04-10-2011, 12:24 AM
 
Location: Chicago
38,691 posts, read 86,882,510 times
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We've had this discussion a thousand times here already...

All of my cars "recommend" premium, and all of them get it. My "big gun" car is squeezing 275HP out of a 2.3L engine. It has a 9.5:1 compression ration and it's turbocharged. The damn thing is gonna get premium no matter what some stupid article says.
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Old 04-10-2011, 01:20 AM
 
52 posts, read 48,379 times
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Quote:
Originally Posted by Drover View Post
We've had this discussion a thousand times here already...

All of my cars "recommend" premium, and all of them get it. My "big gun" car is squeezing 275HP out of a 2.3L engine. It has a 9.5:1 compression ration and it's turbocharged. The damn thing is gonna get premium no matter what some stupid article says.
9.5:1 isn't that high. I'm running 17:1 plus the turbo on regular pump fuel.
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Old 04-10-2011, 02:46 AM
 
Location: Chicago
38,691 posts, read 86,882,510 times
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Quote:
Originally Posted by missed View Post
9.5:1 isn't that high. I'm running 17:1 plus the turbo on regular pump fuel.
It's plenty high for a turbocharged gasoline engine.
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Old 04-10-2011, 03:40 PM
 
52 posts, read 48,379 times
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Quote:
Originally Posted by Drover View Post
It's plenty high for a turbocharged gasoline engine.
Nice catch
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Old 04-10-2011, 04:32 PM
 
Location: Ohio
780 posts, read 2,138,912 times
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With 17:1 might as well put diesel fuel in it ...
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Old 04-10-2011, 06:37 PM
 
52 posts, read 48,379 times
Reputation: 65
Quote:
Originally Posted by POS VETT View Post
With 17:1 might as well put diesel fuel in it ...
...or kerosene, JP8, mineral oil, motor oil, vegetable oil. It'll burn pretty much anything EXCEPT gas.

Back to gas engines though. I had an old Chevy with 9.5:1 compression that hated straight pump gas but ran great on 85 octane if you put a couple gallons of diesel in the tank.
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