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#1 (permalink) Old 08-17-2006, 08:18 PM
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Default New Tires and Gas Mileage

I have a 2004 Prius with about 45,000 miles on it. It had Goodyear Integrity tires when I bought it; on average I got 40 mpg with them doing a combo of freeway and street driving. However on trips we got about 43 on average.
I just tried Dunlop SP Sport A2 Plus tires and like the handling, but the mpg has gone down to about 38. On a recent trip it was even as low as 35 mpg. I'm debating trying different tires.

Any ideas? THanks.
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#2 (permalink) Old 08-17-2006, 08:53 PM
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Look for Low Rolling Resistance (LRR) tires.

I put Michelin MXV4+ Energy Saving tires on my 04 at 45,000 miles. They handle better, have better traction ang even slightly better MPG than the OEM Goodyear Integrity tires. I run them at 42/40 PSI as I did the OEMs. My Prius is now at 64,000 miles and the treadwear looks OK for replacement at about 90,000 to 100,000 miles (about 45,000 to 55,000 on the Michelins).

Others have had good results with Nokian i3 tires (if you can find them). One indication that a tire is LRR is the use of Organo-Silicates to replace some of the Carbon Black in the rubber compound.

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#3 (permalink) Old 08-18-2006, 01:21 AM
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Hi Jeff. Thank you for your tire information. I checked on Tire Rack for the Michelin Energy MXV4 Plus and they aren't very highly rated, which surprised me. I'll talk to my tire guy in the morning about them anyway.

Any body else have any input on tires? I am interested in a balance between mpg and decent handling and comfort; I am a bit disappointed with the Dunlop SP Sport A2 Plus in terms of mpg but love the handling, set at stock pressure.
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#4 (permalink) Old 08-18-2006, 02:25 AM
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I'm about ready to get new tires for my 2005 after about 35,000 miles. I've pretty much decided on Goodyear Viva 2's. They are a Walmart-specific tire. I usually get my tires at Costco, but they've got an extremely limited selection. I've had good experiences at Walmart when doing tire repairs and rotation/balances.

The Viva 2's come with a 60K warranty from Walmart and are described as a "reduced rolling resistance" tire, which I'm assuming means LRR. The tires cost about $55 ea., so it's quite a difference compared to Hydroedges.

Now: If I could only decide between 185 or 195.

2005 Prius - Tideland #6
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#5 (permalink) Old 08-18-2006, 08:52 AM
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And of course you have to figure that Toyota did a lot more testing than a few individual owners who have just changed tire brands, before choosing the Goodyear Integrities for the Prius.
Then again, tires are a personal choice as is oil. I do find 5,000 mile tire rotations a complete surprise after never having done them below 20,000 miles on any previous car I have owned but then Toyota recognizes their suspension systems and I expect it is smart to follow their procedures for reasonable tire life.
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#6 (permalink) Old 08-18-2006, 10:42 AM
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I've read perhaps 5-10 reports from Prius owners that the mileage will improve once the tires are "broken in". Wait a while to see if this happens for you, if you can.

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Pearl is a 2007 Driftwood Pearl Prius
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#7 (permalink) Old 08-18-2006, 10:50 AM
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As I've stated here before-- on Michelin's website they say that rolling resistance improves about 25% through the life of the tire, so you will likely see a drop in gas mileage with most new tires as compared to your baldies.

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#8 (permalink) Old 08-18-2006, 01:21 PM
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Default Re: New Tires and Gas Mileage

Quote:
Originally Posted by blue meanie
I have a 2004 Prius with about 45,000 miles on it. It had Goodyear Integrity tires when I bought it; on average I got 40 mpg with them doing a combo of freeway and street driving. However on trips we got about 43 on average.
I just tried Dunlop SP Sport A2 Plus tires and like the handling, but the mpg has gone down to about 38. On a recent trip it was even as low as 35 mpg. I'm debating trying different tires.

Any ideas? THanks.
Like some noted, the tires may 'wear in' after a few thousand miles. I too switched to a 'better' tire - Yokohama Avids - and lost some mpg for about 3000 miles, now I am back to normal...

2005 silver #6/BC
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#9 (permalink) Old 08-18-2006, 03:40 PM
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I'm not sure about California, but in Texas we are now on 10% ethanol blend in our gasolene which reduces the available energy in gasolene, thus a reduction in MPGs would be expected, in addition, and with now 36+ days over 100ş MPGs are reduced by constant use of the AC.

Combine those with new tires (requiring breakin to wear the moulding pips on the tire tread - and sharp edges on the tread design)... I believe reduced MPGs would be expected.

♫ Charles Suitt ♪ Dallas TX ♫
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#10 (permalink) Old 08-18-2006, 05:09 PM
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Quote:
Originally Posted by ChasSuitt
I'm not sure about California, but in Texas we are now on 10% ethanol blend in our gasolene which reduces the available energy in gasolene, thus a reduction in MPGs would be expected, in addition, and with now 36+ days over 100ş MPGs are reduced by constant use of the AC.

Combine those with new tires (requiring breakin to wear the moulding pips on the tire tread - and sharp edges on the tread design)... I believe reduced MPGs would be expected.
I'm pretty sure we have an ethenol blend here.. but don't see the stickers noting it very often. As far as the summer heat goes.. when we had the high heat roll in I lost 3-5mpg during those few weeks.. (100*F+).

- Phish Phood, Los Angeles, California
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