Tires affecting MPG - Toyota Prius Forum : Prius Online Toyota Forums
User Tag List

 
LinkBack Thread Tools
post #1 of 3 (permalink) Old 06-02-2014, 05:43 PM Thread Starter
IRA
Junior Member
 
Join Date: Jun 2014
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Default Tires affecting MPG

Long time lurker, new member here with 2001 Prius 212,000 miles. On a road trip averaging 48 mpg I replaced my nail infested 175/65x14 tires with Firestone touring 185/65x14 and gas mileage dropped to 36 instantly. Now the local Firestone dealer is arguing that it is not the tires. Please, I have put 200,000 miles on this car and it now drives like I have 4 flat tires. Any advise on how to sound intelligent when navigating through this issue with the Firestone dealer? Thanks
IRA is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 06-03-2014, 03:44 AM
Member
 
Join Date: Apr 2005
Location: Western WA
Posts: 97
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Default

Make sure you have LLR (Low Rolling Resistance) tires. The 2001-2003s came with the LLR tires (if I remember correctly). Also make sure the new tires are inflated properly. There are a number of references to tire pressures in the archives (unless they have been deleted) as well as comments on LLR tires.
fdret44 is offline  
post #3 of 3 (permalink) Old 06-03-2014, 02:54 PM
Senior Member
 
Join Date: Mar 2003
Location: Phoenix, AZ
Posts: 884
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 5 Post(s)
Default

Check sidewalls of your new tires. If Max Pressure is 44 psi (printed on sidewalls), inflate front tires to 44 psi, and rear tires to 40 or 42 psi. Otherwise, inflate front tires to maximum pressure printed on the sidewalls, with 2-4 psi less in rears.) Your mpg will probably return to normal.

Next time, suggest you check out Michelin Defender LRR tire:

http://www.tirerack.com/tires/tires....omCompare1=yes

Note: Classic Prius's came with 50 psi Bridgestones, which are no longer manufactured. Our original tires also did not wear long, as the tread rubber was very thin. I think they put special tires on the early models to increase the fuel economy, to emphasize the mpg advantage of early hybrid vehicles. I had a real problem with tire shops deflating the original tires to 24 psi (and ruining the mileage). Most, including Discount Tire and Costo, absolutely refused to inflate them to 50 psi, citing the safety hazard of over-inflation. Even when I pointed out the "max pressure" on the sidewalls and the owners manual, they refused to inflate to 50 psi.)

Now, with LRR tires, higher pressures are unnecessary; although I still run 44/42 in our 2002 Prius. In the spring and fall when the weather is nice for driving around with the windows down, I still get 51-53 mpg around town, and 44-48 at other times of the year.

Last edited by Phoenix; 06-03-2014 at 03:01 PM.
Phoenix is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



  Similar Threads
Thread Thread Starter Forum Replies Last Post
2010 Prius only getting 32 mpg due to wheels/tires...need replacements GoldenKiwi Toyota Prius MPG & Fuel Economy Discussion 1 07-21-2013 03:20 AM
Latest on mpg's on new Conti.LRR tires... edlambert Toyota Prius General Discussion 7 10-05-2007 08:54 PM
Definitive, sourced info for oil overfill affecting MPG? wayneswhirld Toyota Prius MPG & Fuel Economy Discussion 17 08-26-2006 10:06 PM
SNOW TIRES?????? New rims or swap tires??? gasma Toyota Prius General Discussion 5 09-03-2005 01:04 PM
i need help: new Falken tires are killing mpg's av_in_bc Toyota Prius General Discussion 17 04-20-2005 10:54 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome