[COcyclist]

Isaac, After following your other thread I think you arrived at a great choice in vehicles. My recommendation of “what to mod?” would be to start with low cost/best return mods. It looks like Toyota has done a good job with aerodynamics but the underside may be an area to clean up. I have a full, front to rear coroplast belly pan, side skirts and rear diffuser, with extra insulation under the engine to retain heat when parked. You may be able to block the upper grill and still stay cool enough, especially in winter. (Make sure you have a digital temperature gauge to monitor temperature.) I use a tank style engine heater and a stick-on Katz heater on the oil pan. On cold mornings I will use both. The Katz was added later and I was amazed how quickly it warmed the whole engine compartment.

A small ice chest with multiple pre-dampened “cooling towels” can help you run longer without A/C in summer. Tint as much of the glass as you can.

To retain efficiency and handling on our mountain roads, adopt the Lotus philosophy and “add lightness”. I have removed the rear seats and spare tire to take over 100 lbs from my car.