Does the winter mixture of gas lose efficiency?

[ZEUS]

Using the defroster uses the air compressor as well which could contribute to the drop in mileage.

[tom4bren]

I find that I get the most even wear when I run my tires at 34-36 psi so I try to keep them at 34 year round. That's for on road. Off road is an entirely different story.

Different tires will 'feel' or react differently so you'll have to use trial and error to find what works best for you. Just make sure you keep it in the safe zone recommended by the mfr (I'd never run over 36 just for fear of breaking a bead).

[circmand]

I wondered cause my OEM tires had a max of 40psi but when I had them in for rotation the shop guy said 29 psi. So I need to add a few PSIs tonight.

[JHarris1385]

Thanks for that infomation....I need to check my psi....My tires max out at 44 PSI.

Im leaning towards the defroster as the culprit.
I have always only used synth oil as well.

[tom4bren]

Also have your front end alignment checked.

BTW, I'd try running at 34-36 psi for a while first. IMHO 40-44 psi is higher than I'm comfortable with. IMHO

[Ldub]

I've always experienced poorer mileage in the winter months...currently getting about 210-220 miles per tank.(until the light comes on)
I always let it warm up for about five minutes before I roll, so that doesn't help.
I'm currently running 45-50 psi in my Terra Grapplers, & run about 60 psi for highway use in my Mud Grapplers. I like to go on the high side for less rolling resistance, but admit that's a little higher than most would use.

[JHarris1385]

Im more of a fan of maxing out the PSI's too. Im going to try to roll around town with a little less for a day to two this weekend and see how that works.

I get about the same 210-220 and the light shows up ....then I fill up about 19 gallons or a little more.