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Originally Posted by Hybrid-Battery-Repair
There is almost nothing that you can do to this car that will increase mpg other than aerodynamic improvements (the wiper delete is about the only one), weight reduction (you can drop about a hundred pounds by gutting the car) or reprogramming (MIMA). One thing you can do that's extremely cheap is to properly inflate your tires. I run at 50 PSI and it is good for an extra 5mpg over the stock 38/35psi.
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You forgot a hot air mod and/or rad block to help with winter warm ups. If you live in a cold climate, you can put in a radiator block and leave climate control set to 60 during engine warm up. Two free, simple, and effective ways to improve winter MPG. Maybe you are looking for more superfluous mods though.
Battery modifications are time-consuming, complicated, expensive, and dangerous (to the un-careful modder). That said, many folks here have had great success adding a second battery and/or equipping a grid-charger to top them off over night.
Also, CVT's aren't THAT bad. At least it is a nice smooth ride. FWIW, adjusting your driving style and putting a little more air in the tires (at least 44psi), will net you an easy 55-60mpg average.