('98-'00) New Tires=lowered fuel mileage? - Subaru Forester Owners Forum
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post #1 of 10 (permalink) Old 06-28-2013, 08:27 AM Thread Starter
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New Tires=lowered fuel mileage?

Purchased a new set of OEM spec size tires. AND ponied up for the full "computerized laser beam 4 wheel top o the line alignment" my assumption was (since the car was badly out of align) and the tires where miss-matched crap, (p.o.'s fault not mine) my mileage would certainly improve after this.
Well, no. I am actually averaging about 4-5 mpg less on the highway than before
***?!?!!?

Has anyone else experienced this?
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post #2 of 10 (permalink) Old 06-28-2013, 12:54 PM
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What tire/wear rating? Softer tires, etc all contribute to loss of MPG.


Do you have the alignment printout? Are we sure the alignment is good?
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post #3 of 10 (permalink) Old 06-28-2013, 01:06 PM
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Unhappy

In general, the switch to new tires can result in an initial reduction in fuel economy.

More info.

However, a 4-5 mpg loss is a bit much. Tell us more about the old- and new tires, including brands, models, and sizes.

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post #4 of 10 (permalink) Old 06-28-2013, 07:15 PM
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Could be as simple as under inflated tires. What size tires & what air pressure are you running?

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post #5 of 10 (permalink) Old 06-28-2013, 08:06 PM
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The tread design has a lot to do with it as well- my Hakka snow tires with their blocky/chunky nature and numerous sipes offered up more rolling resistance than the Falkens I ran during the summer, though both were the same size and approximate weight.
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post #6 of 10 (permalink) Old 06-28-2013, 08:26 PM
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Is it possible the previous tires were not OEM spec. I've seen it before on used cars.


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post #7 of 10 (permalink) Old 06-29-2013, 08:33 AM
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Quote:
Originally Posted by crewzer View Post
In general, the switch to new tires can result in an initial reduction in fuel economy.
However, a 4-5 mpg loss is a bit much
This has been my experience

Be careful what you wish for.
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post #8 of 10 (permalink) Old 07-10-2013, 05:00 PM Thread Starter
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Both sets where 205/70/15 per the manual.
Old ones where 3 Firestones (down to the wear markers and 1 (really bald) michilin
I did receive a pre and post alignment print out
New tires are Sentinel UN99 all season tires
Tires are perfectly inflated.
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post #9 of 10 (permalink) Old 07-10-2013, 07:32 PM
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The worn tires having a smaller diameter would tend to inflate the mileage reading, however not likely by 4 - 5 mpg.


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post #10 of 10 (permalink) Old 07-10-2013, 10:16 PM
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Bald tires grip less, roll easier, and get better gas mileage.
Your drop is extreme, add more air, screw any recommended pressure BS.
Next time, go skinnier, 195.

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  Subaru Forester Owners Forum > Technical Forums and Vehicle Assistance > Tire and Wheel Tech

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