('98-'00) New Tires=lowered fuel mileage? - Subaru Forester Owners Forum
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post #1 of 10 (permalink) Old 06-28-2013, 07:27 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, 11:54 AM
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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, 12:06 PM
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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, 06:15 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, 07:06 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, 07:26 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, 07:33 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, 04:00 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, 06:32 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, 09:16 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.

2006 XT Manual, Cobb Stage1, Conti 205/60-16
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