The wrong tires make a huge difference. It's like dragging a boat anchor behind you. To the tune of 7-8 mpg lost.
Also, make sure you have the AC system set to "econ-AC off". Practically anything else you touch will run the compressor. I did my work commute yesterday and got 65 mpg round trip with AC on :-/, with no AC I can usually get 82-85mpg in that kind of heat. This car LOVES heat.
To make sure you're in the right AC (non) mode, first hit the off button, then hit the econ button twice. Adjust the fan as desired.
Sam
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