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  1. #1
    Junior Member
    Join Date
    Dec 2007

    Don't use Cooper / Mastercraft Snow Tires

    I'm very sorry to have to post this.
    I've been a satisfied user of Mastercraft Glacier Grip snowtires on my Prius for three winters.
    But I just got burned by Cooper, and their "new" Glacier Grips are not usable for Prius.
    I always get 51 to 53mpg** on my summer tires (Goodyear Integrity).
    When I switch to my "winter" tires (Mastercraft Glacier Grip) I used to get around 47-48mpg.
    (not bad for aggressive snow tires).
    But a month ago, one of my Glacier Grips got damaged by a pothole.
    So I got (what I thought) were identical, new Mastercraft Glacier Grip tires.

    39mpg !!!!!!!!!! WTF????????

    So, I put my summer tires back on early, and instantly got my 51mpg back.
    I immediately contacted the dealer, then the distributor, and finally Cooper Customer Service.
    Cooper Tire Company did their best to convince me that it was all my fault:
    -I was just imagining it, and my new tires got the same mileage as the old tires
    -It was my fault for overinflating the tires by 1psi.
    -It was my fault for underinflating the tires by 1psi.
    -New tires cannot be expected to get the same mileage as worn out, bald tires.
    -I was not making a fair comparison of mileages (** see notes below).
    -I did not know what I was talking about.
    -My car must obviously be defective.

    Anyway, after weeks and repeated conversations the truth finally came out:
    Cooper is putting ABRASIVE COMPOUNDS in their snow tires to make the tire surface rougher,
    and improve traction.

    Apparently, at the expense of 25% of my fuel mileage.
    Bottom line: Cooper offers NO apology, refund, exchange, or credit for tires that produce poor mileage. If your Cooper tires cause your Prius to get below normal mileage, TOUGH!
    So now, I have a brand new set of 185-65-15 snow tires. And if I put them on my Prius, it will cost
    me over $500 in extra fuel cost over the life of the tires.
    Anybody need a set of tire-swings for the tree in their back yard?

    Caveat Emptor

    ** NOTE: All of the above mileages are quoted for the round trip Buffalo, NY to Albany and return.
    on the I-90, clean, dry pavement, in cruise control at 65 to 68MPH.

    I make this trip at least 15 times a year, and my mileage is very consistent.

  2. #2
    Junior Member
    Join Date
    Nov 2014
    I see. You would rather slide into a bridge abatement at 60 MPH (and 51 MPG) then have some traction? You're brilliant.

    To properly calculate MPG you need to isolate a plethora of variables. Just filling your tank, noting the mileage and then having Mum and Dad do the math for you won't cut it.

    Incredible. Imagine that! Making snow tires with an unequivocally great grip!

    Stay on your side of the road; your logic scares hell out of me.

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