Hybrid Car – More Fun with Less Gas

better mileage with higher octane? - Page 25

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Posted by Mike Romain on January 2, 2007, 6:39 pm
It depends on your engine.  You need to check the gas mileage between
fills to see if there is a difference.

I have a computer controlled Jeep engine in one and it makes absolutely
no difference in gas mileage between 87 and 91 octanes.  I have another
non computer controlled Jeep engine and the gas mileage difference is
close to a hundred miles per tank.  It loses all top end power so has to
be held to the floor on the highway.  This just drinks the gas.

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
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dido wrote:

result in




Posted by Richard P. on January 3, 2007, 1:17 am
Very true.  I used to work for Imperial Oil and they said to use the highest
octane you can use before there was no improvement in fuel mileage.  It
takes repeated mileage tests averaged out to determine the best fuel

My 1971 Datsun 240Z had to run on "supreme" 91+ octane fuel to maximize
power and fuel mileage.  Funny to think that 13 years ago I used to cringe
at the price I was paying for it which was less than the regular priced

I once owned a beater 1976 Toyota Celica GT hatchback who's carbs I leaned
out for maximum fuel mileage and I found it ran best on 87 octane fuel.
Thank god as I was a student at that time and needed cheap transportation.
Until I got my new Civic, this car gave me the best highway mileage.

I had a 1994 Pontiac Sunbird (w/EFI electronic fuel injection) that
recommends minimum 87 octane fuel.  But I found thru repeated tests that I
got slightly better fuel mileage using 89 octane.  Anything higher provided
no gain and was a drain on expenses.

My current car, a 2006 Honda Civic recommends a minimum of 87 octane as
well.  But I almost run it exclusively on E5 89 octane (5% ethanol blend)
and I have found virtually no difference in mileage.  I pay about 5 cents
more per litre but that turns out to be about $0 more per month in fuel
expense, a small price i'm willing to pay for reduced GHG emissions.

Posted by Eeyore on January 3, 2007, 1:50 am

"Richard P." wrote:

It may possibly help keep your engine cleaner too.


Posted by clare at snyder.on.ca on January 3, 2007, 2:02 am

With the gearing on the '75 Celica GT hatch (longer legs than the '76)
I got 55MPG at 70+mph if I could hold steady speed. (Waterloo to
Peterborough Ontario at 2AM Saturday morning, 1979 0r 1980)That trip
was closer to 75MPH than 70 - and at 55 I never got more than 45. 5th
gear, right on the cam (4200rpm) seemed to be where it was happiest

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Posted by Arnold Walker on January 2, 2007, 7:46 pm

If you turbocharge with enorgh mean pressure to need the extra octane.Your
mileage will improve.

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