i3Houston wrote:I am surprised you say 33F/41R. Costco replaced the tires and filled all four to 44PSI, I will double check if tires are rated for that.
I am surprised that you are surprised
Look at the tire inflation pressure label in the driver door jamb.
The maximum inflation pressure for these tires as printed on their sidewalls is 51 psi. For ~5k miles, I ran 43F/51R to see whether the tread wear rate or the uneven wear pattern would be reduced. I couldn't measure any effect. However, the rolling resistance was noticeably less which resulted in longer range and the risk of tire and wheel damage was likely reduced. On the negative side, the tire contact patch was smaller which would reduce traction a bit, and road irregularities were a bit more noticeable.
I do carry a tire inflator in the frunk but Costco fills Nitrogen
The i3's air pump pumps 78% nitrogen which is indistinguishable from 100% nitrogen in real life. A possible exception would be if an i3 is raced on the track. If Costco doesn't charge for nitrogen, your only cost would be your time to drive to Costco and to wait for your tires to be inflated and the cost of electricity for that drive.