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Old 07-08-2010, 01:44 PM   #1
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Surprising Brand Experience

Off brand gas

I usually fuel up at Shell or Husky/Mohawk out here in western Canada. I fuelled at Extra Foods gas bar(Lablaws/Superstore Chain) and found an increase in milage in similar conditions. I have tried several tanks since and the increase has proven consistent.
I never gave much thought to off brands before but maybe they are worth a closer look. Maybe all the additives and ethanol make a bigger difference than I thought.
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Old 07-10-2010, 12:07 AM   #2
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I heard that gas with ethanol in it , up to 10% will give lower MPG

As far as I know Petro Canada does not put ethanol in their gas, but I could be wrong, can anybody confirm this? I am in Ontario.
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Old 07-17-2010, 08:56 AM   #3
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Using E-10 will drop your mileage by ~3.3% (125,000 btu/Gal vs 120,900 btu/Gal) based on just the energy content.

Your station attendant should be able to tell you the E content of the fuel.

If your station does not use temperature compensated meters, the colder the fuel, the more energy per gallon. (Ground temp is fairly stable, In the winter, fuel after the delivery truck dumps, in the summer, fuel before.) I am still trying to get a solid number on the real difference, but it is likely only in the 1-2% range. (Our ground tanks are about 57F here, so the most difference is 30F (15c))
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Old 07-17-2010, 09:09 AM   #4
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It looks like the error with fuel density is less than 1%, not really worth putting the fuel run on a separate trip.
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Old 07-19-2010, 12:01 PM   #5
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actually ac7ss, if i'm not mistaken, fuel trucks are temperature regulated (at least to some degree) andthey care more about the weight of the fuel (a non variable number) than the actual volume
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Old 07-19-2010, 01:11 PM   #6
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Interesting thought! Once I had a look at this thread I went back to my fuel ups and noticed my poorest return came from Shell. I don't recall a difference in driving style or traffic, so maybe I need to run my own little test with another tank of Shell to see if my 'mileage' drops.

Good thread!
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Old 07-19-2010, 07:05 PM   #7
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The trucks cannot control the temp of the fuel much, so it is closer to ambient, (depending on the time that the fuel sits in the truck this may not be much of a difference.)

Yes, the fuel is sold to the station by weight. but the addition of 4000 gallons of 75f fuel to a ground tank of 55f fuel will change the temp of the stored fuel. It is the change at the meter that works with or against you. (As little as it does, less than 1%.)

More people avoid 'Fresh' delivered fuel on the theory that it can stir up detrius in the tank. IMO this is filtered at the pump anyway.
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Old 07-19-2010, 11:42 PM   #8
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i dont think pumps have filters for something as small as the rust in the tank. def not to the automakers grade, the filters would need to be huge to handle the volume/workload, and last any time.
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Old 07-20-2010, 01:08 AM   #9
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They do have filters, and there is not really that much rust in the tanks of most gas stations. (There is also basically no water in gas, otherwise we'd get gobs of rust every time we filled up, and also our tanks would rust.) Just myths that still persist. The fuel density point is legitimate, but a 1% gain in fuel economy is well within the margin of error of tank filling. And that's not really a fuel economy thing, that's just getting more fuel for your money. I suspect the gas station probably accounts for this and gives you less volume anyways.
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Old 07-20-2010, 05:09 AM   #10
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huh. learned something new. i do know some stations in the us do water gas down because of the %10 ethonol. so its built in dry gas
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