Prius V :: After Changing Tires Mileage Drops?


Jul 28, 2012

Other than during cold winter weather, our 2+ year old Prius has been averaging 51-56mpg all around. Our tires needed changing and my spouse went to a tire dealer. The dealer recommended Cooper tires, a model supposed to get 50k miles. Almost immediately we now average 45-46mpg.
In looking back, we didn't buy tires that accentuate mpgs. Is there anything we can do short of selling the tires? And are they makes and models we should think about when it's time to change the tires?

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When I bought the car in 2009, if I had 4 bars on my traction battery at night, it would have them in the morning. Now I can leave the car for 2 hours in moderate weather. When I drive off, it will show 4 bars but driving in eco mode w/o ac, it will drop to 2 within a mile and stay there for several miles before it starts to charge again. My overall fuel economy has dropped 10%.

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Prius (Gen 2) Fuel :: 2007 - Mileage Drop By Over 20% When Put Summer Tires

This Easter I put summer tires on my "new" (owned about 4 weeks) prius -07, and cleaned and greased brakes.

With winter tires (almost new Nokia hakka xx, stud less) I got 4.5 l/100km (52mpg) easy and 4.2 (56mpg) at best, now I get 5.5 (42mpg) and 5.3 if I struggle, if I relax and put cruise control on I get 5.8 (40mpg). I travel 100km to work every day.

Summer tires is Michelin primacy (about 2 seasons?) pumped to 3.0/2.8 bar (over inflated).

Brakes don't seem hot after drive and they was really clean and easy to move after my service so my guess is that they work fine...

Mileage went down over the weekend so I see a clear link.

It was more fun trying to hypermile at 56mpg aiming for 60 then it is at 42 aiming for 45...

12v battery charged, just in case. Still same temperature out 1-8 C. Oil and all filters changed first week (will change trans axle oil in summer). Travel to work got 4% shorter so tire size must be a small reason to the +20% problem.

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My gas mileage (both indicated on the dash and calculated) has dropped by about ten percent. In researching the two brands of tire, I found that the OEM Firestones are rated at 836 revolutions per mile, and the Michelins are 839. I'm wondering if this is the reason for the apparent change in mileage.

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How often have people really been changing the engine filter; cabin filter; and rotating tires? How often is this really necessary? I'm at 108000 miles now.

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The steering wheel mysteriously clocked itself slightly to the right after changing out the standard tires to same sized studded tires for winter. This has never happened before and I was unaware of any alignment/wheel clocking problems up to driving into the shop to swap out the tires on the wheels.

Air pressures were all good and even all around--but I don't know if they were even before the change-out. Also, the wheels were balanced and the drive afterwards revealed no pulling either way or vibrations. On top of that neither the tire store nor my Toyota dealer had any explanation(s).

I'm only guessing at this point that prior to studded tires there might have been a clocking error so slight it was not perceptible in over 5K miles and with the studded tires now it is perceptible.

Q: Is it possible under my circumstances for a different set of tires on the same wheels to make this sort of difference?

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It was missing a bit so I code checked it and 4 plugs were not firing. I got the new plugs and a 3 ft extension for my 1/2 in ratchet and after an hour I got the old plugs out without taking the threads out with them. I bought it used and the plugs looked like they came with the truck.

Now I'm getting 9.3 MPG. runs good but what can cause the thing to lose mileage?

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Passat (B7) :: Changing Tires - Wheel Alignment

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On my previous cars, I've just changed over in the fall and spring by myself unless I needed a wheel balance or alignment. With the harsh winter and roads we've had this year, I'm thinking maybe I've hit too many potholes, since I'm noticing a vibration at 140kph (87mph). I got the current OEM rims and winter tires new last October and had them balanced before installing them on the car and I hadn't noticed anything until about 2 weeks ago. The issue did not suddenly show up after hitting a pot hole, but just started happening and becoming a bit more noticeable recently. The weird part is that it seems to be happening only at that specific speed when accelerating, which makes me wonder if its the wheels out of balance or engine/turbo vibrating under load. As you can imagine, if you let off the acceleration at high speeds, the car slows down slowly and the vibration goes away. So it's hard for me to say what the problem is.

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