How i get 52mpg avg (constantly)

[BennyLava]

Originally Posted by IllusionX

Yes, there is a reason why there is always a max pressure on every tire that take into account rolling.

They did a test on a ford crown victoria with factory wheels and some junky goodyear tires. They couldn't get the tires to come off the rims at 100 PSI, no matter how hard they tried. They put those tires though all kinds of hell trying to get them to pop. After that I'm sure you're probably safe up to 100psi.

Also to the OP, the AC is indeed a power drain of sorts, just like a power steering pump, an alternator, or anything else you have on the belt drive. Now how much that AC is sucking down on a modern car like the yaris with a tiny compressor, who knows. My guess would be that you still lose at least half a mpg, just knowing how much electricity those wall units will drink. That energy requirement won't change just because its running off an internal combustion engine instead of an outlet.