Well a 28C won't fit on the rear wheel so I'll have to stay with the 23C tires.
Today I dug pretty deep into the pack. Did a 35 mile trip, temperature high 70's rolling terrain, on the pack. When I rolled back into the house the voltage was sitting around 36.6v which is the lowest I've seen it. Recharge time was 4 hours at .18 kwh. Which come out to
6,525.2 eMPG. W00T.