psteng19

I believe the door jamb recommends 32f, 30r psi.

I have mine to about 38 psi all 4 tires.
Currently on my tank of gas, it's showing 35.8 mpg in 80/20 hwy/local, so if you deduct 2mpg for the MID's over-compensation, I will be getting about 33-34 mpg.

But I also changed the engine air filter, change to 5w-20 M1, and put in a bottle of Chevron fuel system cleaner

nj2pa2nc

I have what the door jam recommends- 32 front 30 back on the oem tires on my 06 tsx with 53,000+ miles. I average 32-35 MPG, changed the filters also.

Jim Holloman

I run two pounds over. I would not recommend running 6 and 8 lbs. over because you lose a lot of traction -- especially on slippery and roads. The higher the tire pressure, the smaller the footprint and the less the grip. Thank of how much traction you would have if your tires were perfectly round. The degree of contact with the road surface would be very small and the grip would be unacceptable.

malnik

Inflating your tires over the recommended PSI might affect the braking and handling ability of the car. Also, the tire tread will wear out faster

muncher

mods are gonna move this to off topic discussion =/

ATsxMan8305

35R/37F cold

DixonTSX

34F/32R cold

afici0nad0

36 all around cold on falken 452's.

38 all around for viking snowtech winters.

rx280

I keep mine 2 to 3 pounds above the recommended 32F-30R, mostly in hopes that it has a slightly beneficial effect on fuel economy, but also as a cushion against under-inflation (even though I do air-pressure checks pretty regularly.)

Mokos23

i looked and mine are

37 front /35 rear cold, but then wow i just looked after driving all day my tires went up to 40 front /38 rear, yikes!

i may also buy that fuel system cleaner, but i thought that v-power and bp ultimate already do that.

PixelHarmony

You guys average some great fuel milage even for 80% HWY! I remember when I used to try hard to save gas.

My civic gets about 27mpg all city driving. Back when I had the TSX I think my all city mpg was around 17-19mpg.

PhiDelt

mid 40's, the Falken 512's say up to 51 psi, i do mostly (90%) of my driving on the hwy and i like the feel of higher PSI in the tires esp. on the highway.

terpfan29

are these readings from the MID TPMS? How accurate is that system anyway? Mine fluctuates a fair bit.

psteng19

I measure from the tires with a regular gauge.

nj2pa2nc

i also do it that way-no TPMS on an 06.

808havok_tsx

i would think higher the psi, the more solid sidewall and therefore better wear and contact across the treads. manufacturer's recommended 32f/30r is a compromise for ride comfort. i found 32f/30r too soft and too hard to steer in the parking lot for my tastes. i've done 40f/38r but the ride was too bumpy. now i run 37f/35r cold psi. OEM michellin tires are rated up to 41 cold - you can play around with the pressure between 30-41 and see what you like the best and what fits your environment the best...

the tpms is probably the most accurate pressure reading. any external gauge reading will overstate the pressure by about 2 psi...

DogsTSX

If u have stock rims and tires just go with what the door sticker says.

Mokos23

i have the same, 37/35 cold, but it goes to 40/38 when the tires heat up

1Louder

I've been there, done this, with my 03 Civic Hybrid (before my TSX). I ran the tires at max 44 psi for years. In the end it didn't make a real difference - 1, maybe 2 MPG (and this on a car that was getting 45 mpg to start with). The problem: Rain will make that much difference. So will wind, traffic, and a half-dozen other variables. It's nearly impossible to isolate the true benefit running high psi. Plus, there is the issue of traction, harsher ride, and a lot more noise.

I'm all for milking the TSX for good mileage - it's an outstanding car to do that with, but if you really want to make big marks on your mpg, look at how you drive. That's the #1 way to improve mpg, and can easily make a +/- 15% difference of not more. Keep your car tuned up and use the right fuel. If your running high psi but racing around town, you're defeating the purpose.

I run what the car recommends, and I'll take the benefits in ride and noise over driving an extra 12 miles on the tank. I have a solid lifetime MPG of 29 (over one year).

baxter263

Wow, those numbers are impressive! I drive my 04 TSX fairly gently, and still only get about 22mpg in the city, using premium gas. The car has over 63k on it, so I attributed the poor mileage to its age, but apparently it could be something else (though I don't have a lead foot... most of the time :-)).

Mokos23

to the OP, i also bought that fuel system cleaner. how much did your mpg improve?

psteng19

It's hard to say since I did all the things listed at pretty much the same time.
lower weight synthetic oil
over-inflated tires
new air filter
chevron fuel system gas additive

I can say collectively, the adjustments improved my mpg from 31.9 to about 33.8 mpg (but the 33.8 mpg trek had slightly better traffic conditions).