OK- I'll bump the almost 11 year old thread

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I check the home fleet often, normally early on a Sunday before sun hits anything and they sat all night. I normally go about 2 psi over the door sticker but I also use my tread depth gauge often to check the wear across the whole width of tire. Helps to let me know if inflation and or alignment issues. My Sonata always needed 2psi more in front than rear to keep wear even. The spares get checked every couple months and I normally fill them about 5 psi high to account for time and temperature loss.
Now in the TPMS world and different types of systems. Who uses and recommends what pressure gauges? I have 2 Slime Sport digital ones in 2 cars that I had forever and kept everything good. I have 3 others that look just like it, forgot the name, in the other vehicles. They all have an old school stick version in bottom of glove box also in case I need or have also given to others. Something is hopefully better than nothing with kids friends and others. I never really compared the 5 digital ones to each other, just used them in those cars (and helping other people).
My '19 Pilot and Father-in-laws '16 Renegade have the readout on dash that I check often before driving, they show PSI right away. Easy to see that they are all good. My son's girlfriend has a '21 Tucson, that needs to "wake up" for almost a mile before giving readout. '08 CRV and '10 Forte have sensors but no dash readouts. '17 Accord has indirect through ABS, no sensors.
This past weekend I used my Accord Slime digital and checked all the fleet. Tucson was all out of whack. I set to 36psi knowing she was going back to school the next day. She asked later if I fixed them for her because her friend inflated one that popped the TPMS on one colder morning. She asked why I filled them all to 39psi? Huh??? Now I go to Pilot and Renegade early cool cloudy day to check them as well as Tucson. I use the Slime from Accord and Pilot. Both read the same on all 12 wheels but 1.5-2psi lower than Pilot and Renegade TPMS show ( both Slime 33.5, Pilot 35, Renegade 35 both Slime, 37 TPMS). I check Tucson at 36 on Slimes, dash says drive to display

. OK almost 1 mile down the road before it displays 39 on all 4. QuickCheck is at the end of that mile with free air that you set to and beeps when at whatever PSI (I did 36). I had to bleed air out lower and refill. QC beeped at 36, both Slimes read 34. TPMS showed 36 on drive back and then one popped to 37.
I just bought a
Jaco digital and a cheaper
Astro Ai. I checked the Pilot this morning. TPMS 35. Both Slimes 34.5. Jaco 34.4, Astro Ai 33.7. The Jaco says Calibrated to +- .5% full scale.
I'd rather be 1-2psi physically over in the tire then under also to account for lack of possible checking. I walk around all of them also frequently. The Astro Ai was harder to get a good seal than the others.
Fortunately I haven't experienced it yet. Would the Tucson show sooner if one was flat or very low? I don't know on Accord either it only popped on 2 times. Once with a nail while driving and was down I think about 8psi. Once when dealer OVER inflated and all 4 were about 8psi high from last "TPMS calibration", let some air out and TPMS went off.
My Son's Forte popped on right away when temperature dropped 60-70 degrees in a week.