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Costco winter gas - poor mpg?

Discussion in 'Canada' started by BackCountry, Jan 7, 2013.

  1. Jan 7, 2013 at 10:17 PM
    #1
    BackCountry

    BackCountry [OP] Well-Known Member

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    Hey Folks,

    I haven't given much thought to gas quality and I'm still getting to know this truck, however lately I have been giving a lot of thought to gas mileage.

    I'm not much of a number cruncher and I haven't been very diligent with tracking my KM's to Litres. However I know that I usually get around 425ish KM on a tank, and that's with about 12 litres left.

    Lately I've been filling at Costco because it's close and usually about 5 cents cheaper. After my most recent fill, I noticed my MPG was suddenly very poor and I had to re-fill before 350km. On suspicious of gas, I filled at Shell and I'm now on track for one of my best ever mpg/tanks.

    Highly anecdotal at best. But a little googling seems to suggest that Costco gas especially the winter formula has lots of ethanol and can be a cause of poor gas mileage.

    I'm assuming Costco must have recently switched over to a winter formula? Anyone else notice a sudden big difference in their gas?

    I did recently have a o2 sensor replaced, but the extreme drop was a few fills after.
     
  2. Jan 7, 2013 at 10:19 PM
    #2
    OZ-T

    OZ-T Thats what it is to be a slave ...

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    I usually get 425 kms when the light comes on , but I haven't used the Costco gas , but my best mileage has always been with the Shell 91
     
  3. Jan 7, 2013 at 10:33 PM
    #3
    Rich91710

    Rich91710 Well-Known Member

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    Costco and Sam's/Walmart are going to run a higher ethanol content since it's a cheap octane booster.

    I've had Costco summer gas "turn" in 3 months stored in jugs for my dirtbike.
    Dad used to have a 5 gallon jug for the mower that he'd refill maybe once every 2 years back in the 70s.
    Back to my dirtbikes, Chevron holds for 6 months without problems.
     
  4. Jan 7, 2013 at 10:40 PM
    #4
    cdthiker

    cdthiker Well-Known Member

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    Tim
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    gotta love that winter blend....
    I have had this problem with my 2010 Subaru... the 12taco seems to be less picky....
     
  5. Jan 7, 2013 at 10:46 PM
    #5
    Janster

    Janster Old & Forgetful

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    Jandy
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    I get gas at the same places all year long...... WaWa and Turkey Hill.

    Winter gas blends are different than summer gas blends.
    http://auto.howstuffworks.com/fuel-efficiency/fuel-consumption/summer-fuel1.htm

    My truck will lose 2mpg every winter....no matter what gas I use. I will run 17-18mpg in the summer and 15-17 in the winter. And no...it does not have anything to do with 'warming' the truck up.

    For some reason, I think Toyota's (our trucks - or atleast mine) gets worse mileage in winter. My husbands Acura isn't affected by the gas. ????
     
  6. Jan 8, 2013 at 7:25 AM
    #6
    vicali

    vicali tirekicker

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  7. Jan 8, 2013 at 7:40 AM
    #7
    MTgirl

    MTgirl too many frogs, not enough princes... Moderator

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    I hate Costco gas. I would fill up there occasionally but a couple of years ago I filled up about 2/3 of a tank right before a trip to Yellowstone and haven't been back since. About 40 miles into the trip my engine developed a knock and was idling really rough, scared the crap out of me. My usual Yellowstone route takes almost a full tank of gas and I would usually just have my town in sight when my low fuel light went on. Well this trip it came on 40 miles early. I ran around the next day trying to burn off as much of the gas as I safely could and then went to an ethanol free station and filled up with premium. Truck started to run like normal almost instantly and that was the last time I bought gas from Costco. And that was with regular, summer blend!

    That being said all winter blend gas sucks and I see about a 10 to 15% drop in gas mileage every winter.
     
  8. Feb 14, 2013 at 3:36 PM
    #8
    Dave Russell

    Dave Russell Active Member

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    I'm not up on winter/summer gas but I keep track of my mileage and when I switch over to winter tires it goes from 23-24 down to 19-20 MPG. My winter rubber is Toyo Open Country MTs 245/75/16. Summer I run Yokohama Parada 265/50/20's. I always buy gas at the same co-op. My Taco is a 07 extra cab 4x4 V6 6 sp. I run the tires at the same pressure winter/summer so I'm guessing the difference may be the rubber compound and the tread design. This pattern has repeated for 3 years now and the change happens with the first fill up after the tire swap. That's my 2 bits worth.
     
  9. Feb 15, 2013 at 1:17 AM
    #9
    Janster

    Janster Old & Forgetful

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    My truck is an 07 and is totally stock.....and I've had it since new.

    Every year / winter ...doesn't matter where I get my gas or what tires I've been running (on my 2nd set of tires)....the mileage always drops 2-3mpg with the winter gas. Doesn't matter what octane I use or what tire pressure I run...... I'm accepted it 'as normal' for this truck. And believe me, I don't understand it either. I've never had a vehicle that was affected by gas like this one has.
     
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