AC will definitely make a difference, especially in the high heat where the compressor will be engaged most of the time. I've measured as much as a 20% drop in fuel economy from running the AC in the summer on my old Civics. The compressor eats up a good bit of power- which the Z1 engine doesn't have much to spare. I live in Texas though, so the AC is on all the time.
Pedal behavior makes a HUGE difference too. I just took a long road trip in the family Mazda 5- trying to catch up to my in-laws, I got only 20mpg on the highway. With the car set to cruise at 70mph the whole way, I got 30mpg. Big difference.
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Intercrew Auto Salon
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