My TPMS light came on this morning, but went off about 3/4 of the way to work. I checked the tire pressure when I got to work. Both left tires are at 32 PSI and the right two are at 30 PSI. I started with 84 miles RR, drove 10.5 miles at 45-50 MPH and arrived at work with 75 miles RR.
Based on RR values and charge gauge alone, I had no idea that my tire pressure dropped that far. I set all four tires at 40 PSI, but it was a while ago when I last checked them. I've been consistently getting high RR values (70-90 RR range in the last month, all sorts of driving) even with (presumably) below recommended tire pressure.
Either way, this was likely the nail in the coffin for the i-MiEV as far as Mitsubishi is concerned. 'Tis a shame, really. The engineers really got this car right.