Stock with air conditioning as the only OEM option.
Mileage with air conditioning on at 70 mph is about 42 mpg. OEM tires at 45 psi (max sidewall, lrr Contis).
Receiver hitch, 8x5' aluminum Featherlite flatbed trailer - can pull 1000 lbs no problem. iPod/iPhone,CD/AM/FM radio, Slime air compressor, coasting transmission.
Replaced wide OEM rear wheels with narrow front wheels; replaced wide tires with 155/60R15 ContiPro high-mileage tires - all at 42 psi. Installed an UltraGauge which has every gauge except the kitchen sink gauge. No, I take that back. There's the kitchen sink gauge... I use a handheld anemometer to determine the optimum mpg speed. I have mounted a flowerpot bird with springloaded wings on the front cowling to indicate turbulence, wind speed, wind direction and drafting sweet spot. Drive barefoot for throtle control. Plan my long trips for tailwinds.
Air dam, rear fender skirts, supercap electric engine assist, full body skirt, solar roof, renewable hydrogen injection.