I live in near vancouver BC so I rarely have to use the AC.
You have probably done all you can for weight reduction. The only other things I would suggest is the spare tire under the rear bumper and the jack and tools under the passenger seat. If you have On-star or AAA then you could risk a flat without a spare. Some people keep their gas tank low to save hauling extra gallons of gas around. Fill the back with helium balloons? Some people also remove all the carpet and panelling but that looks like crap in my opinion. I like my previa so I keep it looking good.
Some kind of fuel efficiency instrumentation can also help a lot.
It's too bad there are no ecomodding shops around. You can bet if the price of gas stays high there will be.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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