I filled up the tank in the Prius yesterday, and:
1) Holy crap, gas is expensive!
2) Running the A/C every day really hurts MPG.
Average fuel economy seems to have dropped by 8-10 mpg. The trailer hitch install was near the end of that tank of fuel. So it had little if any effect. But I didn't expect the A/C to have such a large effect on fuel economy.
I also noticed the Auto A/C basically does the same thing I was doing manually. It starts out at full blast to knock out the heat, then settles down to maintain a steady temperature. So now, I just let the auto A/C do its thing. Less fiddling with controls means less distractions while driving.
Also, RockAuto finally got some control arms in stock. Hopefully they're the correct ones this time...
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