Well, Ive been averaging 33mpg at each fill up , so this morning my tire pressure light came on but all the tires looked the same ( not low or flat looking ) so as I started the morning I had 1/4 tank remaining and my guess was I would hit approximately 300 miles on the trip before refueling.
So on my way home I stopped to buy a pistol inflator for the compressor with the guage. My tires are showing 51psi, when I hooked the inflator up it was showing 30psi in each tire, wow, they were low. So I aired them to 50psi and made a run for the city and back as well as a few small stops in between, NOW I have surpassed that 300 mile, I apparently had a lot of drag before so now, I will see if my mpg's have increased this tank.. Will be going on a Scout Camp this weekend so I will also be loaded down with (2) 8 man tents, Large Cooler, folding chairs, fishing gear, sleeping bags and air mattresses for all as well as clothes and more... I'm going to have to get a picture of this, A Fit fully loaded with 4.

 

I wouldn't do 50 psi for a fully loaded car. Mine is aired up at 42 psi. You might be at the max psi limit for your tire. but yes more air is related to lower rolling resistance. however you're gonna lose mpgs with that much load.

 

Gee, I keep my tires at 32 (according to the manual)

 

That would be for that specific tire... some are 32, 44...ect

 

The PSI stamped on the tire is the cold psi a tire should be aired to. Yes, I thought it was unusual myself.

 

A little confusing as max psi is to carry the max load, but not the best? Hmmmm, maybe go 40???
Ive always aired mine at the max psi on every car Ive owned and never an issue, BUT I have noticed the FIT is a lot harder ride.

https://www.kaltire.com/the-right-ti...isnt-the-best/

 

I've been using 40 psi on my tires lately to see what my mpg would be. I'm looking to get 40 mpg and I'm still not there. I'll see if I can do it after doing a valve adjustment.

I have yet to do a valve adjustment on this Fit. I bought the car with most of the mileage on it already. The manual said to do the valve adjustment if you are hearing noise. I'm not, but I'm going to do it anyways.

Anyways back to the PSI. I was using 40 psi on a car back when I was driving and it made a good increase on mpg, but handling really suffered. Nowadays there really isn't that much of a drop off. If you can handle the drop off and don't mind it, do it. Also if it's with in the range of tires specs!

 

You will probably see benefits after the valve adjustment.


I recently did one on my CR-V, and throttle response/drivability and MPG were noticeably improved.





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There are SO many things that contribute to good MPG. For example, we just recharged the A/C's R134 on our Fit. Result: the compressor cycling time is less, so MPG with the air engaged is better! Still, less MPG than in cooler weather before A/C wasn't needed.