I've seen a bunch of posts as of late about people discussing how many miles you get to a tank. In my 99 5spd I usually would get about 430-450...mind you I do 85% highway driving though too. Going to the track last weekend I had dropped my tire pressure down to about 27 psi. I checked it when I got back home and it only increased itself up to 28. Its holding nice and steady there. Well on to the test of sorts. I have filled up twice and ran it out all the way to the point I normally do. I'm driving just the same as always. On 28psi tires up front, I have noticed two things...number one the steering is stiffer, number two I dropped all the way to 365 on the miles per tank I got gas at the same place as always so no difference there. This week when I fill up I will put the tires back up to recommended pressure and see if that will put me back where I should be as I'm sure it will.
So for all those guys complaining about short mileage per tank...I suggest checking your tire pressure's out and setting them to the factory min....Hope this helps some people.

 

what is your recommended tire pressure that you usually run.

 

If you open up your center console look under the lid..it has the manufacture recommended in there. I cant remember the exact numbers..

 

With you lowering your tire pressure you are increasing the contact patch which means more rolling resistance (i.e. more gas, less mileage) Your statement is correct, tire pressure can/will effect MPG this has been written in stone since the 70's when we had our gas crisis. There's too many varibles to compare my miles per tank to your miles per tank, way too many.

 

That's what Michelin was doing their Energy MXV green tire, trying to lessen rolling resistance. But it's physics, kinda like saying the tires wear less when driving in the rain.

I do a 35/32 F/R (weird but whaddya want it's FWD) and the car delivered good gas mileage at least the first 2-2 1/2 yrs of its life where it got on the highway a lot. 27 is a bit low but I don't think imho it's gonna be more than 1 mpg difference if that. But hey, if the results can be repeated then I stand corrected. There just doesn't seem to be any benefit in lowering the pressure below recommended unless you're looking to add wear to the treads.

 

Don't forget, the more pressure in your tires, the more uncomfortable your ride will be.

 

One thing that is ****ing me off. My front tires are at around 36-38psi but they look like they are underinflated. I don't want more air in there to blow them up. What to do???

 

Get lower porfile tires

 

Your sidewalls could be softer than most, or it could be just because it's a radial tire. What is the max pressure rating on the sidewall of your tires? I think Nissan took in to account general tires when they came up with their tire pressure recommendations. It's a compromise between mileage and comfort. Some tires have a higher max pressure than others (some even 44 psi compared to most 35 psi's). I keep mine at the tire manufacturers max for better wear and mileage, but sacrificing a little plush comfort. It's a personal preference.

Dave

 

MY ES100S havea max rating of 40psi and I'm running them at 28.....which is way to low....I will run about 36 or so.

 

They have 44psi as the max load...

 

my htr zII's are supposed to be @ 51.. i'm still undecided on how high to keep them, 51 just sounds really really high...

wJ