I've noticed a huge reduction in MPG with the temps getting down to freezing and below. I was averaging 27-28 MPG up until about three weeks ago, but now I'm getting 23-24 MPG consistently. I've experienced cold weather MPG reduction in other vehicles, but not this much. The cold weather affects city driving MPG the most, which makes sense. On other vehicles, I've experienced a 1-2 MPG drop in freezing temps.

I'm wondering if my tire pressures have something to do with this. Last time I topped off tire pressures, it was around 50 degrees, and I had each tire at 30-31 PSI. The next day the temps dropped into the 30s and the tire pressures immediately dropped to 27-28 PSI.

What do you guys do with your tire pressures when the temps drop? Do you keep them at 30 PSI or above?

 

Really... i did the Nitrogen fill, It doesn't fluxuate with temps....Give it a try

 

how much is the nitrogen fill at a dealer?

 

I think it was $65.00. But then you got it and refills are free from then on if you have issues.....Well that's the way it is here

 

Anywhere from $20 to $60 if you drive in and want it done.

 

my buddy from chevy dealer here just texted me its 19.99
so i guess i might just go do that today so ill have steady
pressure

 

There you go...I like it alot. I've had it for over 7 months and it works great...

 

does it ever go down ? or just always one constant pressure

 

i'm going to be filling up my tires today (6 hours of driving tomorrow...)

My tires were at around 30-31 like you (although they should have been at 33, but the guy at the dealership wasn't exactly a good listener...) and when the temps plummeted i am at the same as you now with the tire gauge light yelling at me.

So i am going to be putting them back at around 33 again.

Now on to the nitrogen part, not trying to sound mean at all here, but isn't the nitrogen tires things s scam? When you fill a tire normally with compressed air, it is already 78% nitrogen, that's just the way it is, science. So, when you pay for it, you're only paying for 22% of your tire to be more nitrogen.

Now if a regular tire is already 78% nitrogen and another tires is 100%, the regular one fluctuates with temperature, the other one would have to flux at well. Maybe not as much, but when there is only a 22% difference in it's content...

ANd i was just wondering since i really don't know the current costs and have only looked into it a long time ago, how much does it cost to get nitrogen? I personally just go with the compressed air because it is essentially free. This time i do have to go and get it down at the gas station because a blew my compressor out, but there will be a new one under the tree tomorrow.

I've read articles both way on the nitrogen subject though (so i'm not just throwing assumptions out here) and it seemed like the pro nitrogen people didn't have any claims to back it up besides the ones that they're told. But the ones saying nitrogen is a scam go on to prove that it does flux, the makeup is not that different and mileage doesn't really improve (with most of the time the mileage claim is the fact that you will get 3$ better mpg on a tires at 31 instead of 24....well duh.... just gotta keep your tires up).

 

man, a lot of posts while i wrote that up.... lots of people home from work today...