I'm taking a 1,000 round trip to Oklahoma (Broken Bow)to go fishing this weekend and I want the best gas mileage possible.
'03 SE w/ 18" wheels 43,000 miles.
I figured some extra air in the tires would really help - and they have a mileage warranty, so I'm not worried about them wearing out too soon.
I'm thinking 32-36 psi in front and 40 psi in the rear - Thoughts?

 

Better fishing in Tahlequah.

I've got 16's no recommendation on pressure for 18's..

 

I just went for a ride with 36 in the front and 40 in the rear - it rolls nice, but you feel every bump.

I'm not in charge of picking the place, I just got invited to tag along - it's more of an opportunity to take the Disco on some trails up there and to drink beer with friends.

 

Increase your air pressure by 5#'s over what is recommended on the tire sticker inside the drivers door jam. Also replace the air filter and buy 2 bottles of good gas additive, to be used one per tank full.
Mike

 

My 03 with 18's requires 30lbs in front and 46lbs in the rear according to the door sticker. I drive it on long trips regularly at that pressure and it gets a solid 19 mpg on the highway.Iunknowingly ran 36 in the front and50 in the rear for several months last summer (tireshop's mistake) and didn't get any different mpg's.

 

I don't know, the logic doesn't really work out in your favor. The theory is good, but let's assume your truck gets 14mpg highway now. You increase your tire pressure, let's assume you get 17mpg on your 1000 mile trip. Premium gas where I live is about $3.10 right now, so your savings in gas would be $37 for the trip. Add in the the cost of fuel additive and air filter as previously mentioned, plus the increased risk of a blowout due to overinflation and I think your profit margin is negligible. I say inflate your tires to normal specs, have a nice comfy ride in your disco and catch some fish!

 

I am inclined to agree. It starts out cool, but gets really warm under that Texas sun, pressure keeps going up, the hotter it gets..I kinda lean towards regular PSI too. Especially with the 18's.

 

I don't want to hijack, but on my 2001 disco II, the air recommended is 46 and 46. I bought the truck used, and the previous owner replaced the tire with different one, on the tire it says 40 psi max !!! so I put 36... I hope I'm close to what I should have..

 

What does the side of the tire say?
If it says P255/55R18 - you have car tires and shouldn't put over 40 psi in.
If instead of P it says LT you can safely inflate to 50 psi.

 

i'll double check !! thanks !