[MetroMPG]

I'll admit I don't do it regularly enough.

But holy cow, I had a rude reminder to check my tire pressure this morning. I hadn't measured the energy usage of the last half dozen or so charge cycles in the ForkenSwift until last night's charge, and this one was awful.

396 Watt/hours per mile. One of my worst ever, in the 70+ cycles I've recorded. (Works out to about 85 MPGe using BTU equivalence - which is pretty lousy for an EV of this size.)

(For comparison, my "lifetime" energy use is 288 Wh / mile. That's measured at the wall (Kill-a-watt), from data for 70 charge cycles, and includes summer and winter driving - more summer than winter, though.)

So I checked the tires, and sure enough a couple were well down, ~13 lbs below where I normally have them. There were other contributing factors to the bad performance, but the tires were a big part of it.

Weather's getting colder (for those of us in the northern hemisphere)... So check your pressure!