[PaleMelanesian]

For mods, try to make your car more like the Civic Hybrid. Those underbody panels, trunk lip spoiler, smooth (and light!) rims, etc.

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I disagree on using DFCO. I avoid it at all costs. You'll get better mileage by coasting in neutral. Even though the engine is using fuel at idle rate, the much extended rolling distance more than makes up for it.

I try to drive without ever using the brakes, and that includes DFCO which is engine braking. If you're braking, you are bleeding off excess speed. You burned gas earlier to generate that speed, and now you're wasting it. It's not completely possible to avoid the brakes, but if you're careful about it, you can avoid braking except at forced stops like stop signs. You can usually anticipate and time lights, to hit the green.