Anybody check TPMS readings against actual guages? If so, how close to same readings were they? Just curious if I can trust TPMS readings.

 

Actually, we just got our first real cold front of the year here, 49* this morning and due to be 42* tomorrow (and I got an 8am golf tourney, yay!) so I just upped the air in my tires a couple of hours ago.
Truck ain't got TPMS, but my Grand Cherokee does. Overhead was dead on with my hand gauge...

 

Mine seems to be dead on with what the real pressure is. Between .1-.01 difference which at that point you're just splitting hairs.

 

The TPMS sensors must read in whole psi only. My EVIC is set to metric, so it shows the pressure in kPa and only changes by 7 units at a time as the pressure changes. It's a little weird (and hard to handle with my OCD, lol).

FWIW, the sensors do seem quite accurate compared to any pressure gauge readings I've done.

 

Hey hard, since your EVIC is set in metric, is your instant fuel economy a little funky? I know when I switch mine over, the graph seems to be backwards or I'm not getting it right.

 

It's not backwards, it's just in the metric liters per 100km, in which case lower is better.

 

Fair enough. I looked at it for like 30 seconds while moving down the highway and said," Hmm, ok?" and went back to US settings. LOL

 

I wondered the same thing about the TPMS. So I took my truck to Discount Tire as they have an air machine that is a digital readout and they set it and then it will shut off automatically when that PSI is reached. SO I told them to put it at 50psi on all 4 tires (Nitto Grapplers). When they were done I started the truck and looked at the display. 3 of the tires read 50 psi and one of them read 49 psi. So that is about as perfect as I could imagine it being.

 

Mine readings are way off so I won't even bother with it. I checked with 3 guages and they all read practically the same. However the digital readout was an avarage of 5 lbs. off and all tires showed a different pressure.

 

That's just the New Mexico spiritual vortex interfering with the nutrinos inside the sensors. Same thing happens when you cross the border into California due to the coriolis effect.

We don't have no problems with that in the grate state o' Texshus since we mezure everthang by the "$hit load".