What is the best tire pressure?


Asked by Jan 22, 2012 at 12:25 PM about the 2004 Mazda RX-8 4-speed

Question type: Maintenance & Repair

I live in Michigan, and I have to drive my car all year.  I have had several people tell me to keep
my tires at 32 lbs, 51 lbs and 45 lbs while driving in the winter snow and ice.  I really do not know
how much to put in.  A lot of times when the temp drops the pressure light comes on and
sometimes it goes off while driving, other times it doesn't.  Also is nitrogen a better thing than
regular air?  

3 Answers


Running them that much more than the recommend pressure will probably ruin them. Usually 3 to 5 pounds is the most you should go over in a winter tire. Nitrogen is better than regular air. It stays in the tire better, extends tire life, and can improve fuel economy slightly.

3 of 3 people found this helpful.

ok first of all refer to your owners manual for suggested air pressure in your tires. 45 and 51 are way to high even for snow n ice. you are actually supposed to let some of the air out. second no nitrogen is not regular air, its in fact nitrogen. not the air we breath. the air in your tire just doesnt leak out or go away what happens is the when the tire is cold the air inside the tire compress even more so its like you have less air. when your driving down the road your tires heat up and heats the air up inside the tire. which expand causing the pressure to go up. like a ballon. what makes nitrogen special is that is doesnt compress and expand nearly as much as the regular we use. the reasoning behind this is down to the chemistry of nitrogen. not explaingin that. they use nitrogen in aircraft tires because it doesnt freeze and has no water in it. and it doesnt expand under extreme heat. idk if it will imporove your gas milage or not sounds like bs to me. but it wont extend your tire life. do googling you'll understand

1 of 1 people found this helpful.

Nitrogen will marginally improve gas mileage(only 2-4%) because it leaks out less which will keep the tire at the correct pressure for longer periods. This causes the tire to rotate more easily leading to less fuel consumption. It extends the tire life due to it ability to disperse heat as well as it less oxidizing nature compared to oxygen. Here is a study providing more information about the benefits of nitrogen http://www.getnitrogen.org/pdf/print_articles/Technical%20-%20Why%20Nitrogen%20Inflation%20Extends%20Tread%20Life.pdf

1 of 1 people found this helpful.

Your Answer


Looking for a Used RX-8 in your area?

CarGurus has 284 nationwide RX-8 listings starting at $500.


Mazda RX-8 Experts

  • #1
  • #2
    Paul Wilson
  • #3
    Michael Kane
View All

Related Models For Sale

Used Nissan 350Z
33 Great Deals out of 1,000 listings starting at $3,950
Used Ford Mustang
278 Great Deals out of 38,285 listings starting at $1,995
Used Mazda MX-5 Miata
49 Great Deals out of 4,381 listings starting at $1,500
Used BMW 3 Series
902 Great Deals out of 32,870 listings starting at $1,000
Used Mitsubishi Lancer Evolution
8 Great Deals out of 521 listings starting at $14,000
Used Honda Civic
354 Great Deals out of 51,455 listings starting at $1,200
Used Mazda MAZDA3
203 Great Deals out of 25,803 listings starting at $1,900
Used Mitsubishi Eclipse
9 Great Deals out of 916 listings starting at $1,800
Used Subaru Impreza WRX
33 Great Deals out of 1,136 listings starting at $3,500

Used Cars For Sale

2011 Mazda RX-8 For Sale
5 listings starting at $8,500
2010 Mazda RX-8 For Sale
5 listings starting at $5,995
2009 Mazda RX-8 For Sale
25 listings starting at $5,500
2008 Mazda RX-8 For Sale
27 listings starting at $5,995
2007 Mazda RX-8 For Sale
26 listings starting at $4,200

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.