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I ran nitro in my last set of 255/45/18 kuhmos on my 02 Q45.
ran at 43 psi the whole time.
Never, never had to 'top them off'. The infiniti has a tire pressure system that posts the psi on an information screen. it fluctuated 1psi.
I got just at 40k on that set and bought a new set about 6 months ago.
now, the shop, The Radial Tire Store in Sacramento will only do nitro on new tires. They wont fill existing tires.
My understanding is that the nitro tank has (almost) zero moisture, where a normal air tank has some moisture.
I made 3 trips to Texas from CA with those tires. 2 times during the heat of the summer.
I didnt pay for the nitro so I had no real vested interest.
THe Shop is aware of my concern for mpg and that was part of the reason they suggested it.
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