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Perhaps the recent lowering of gas prices means you're not quite as concerned about filling up and driving about. But, if your car has a tendency to sit while you walk or bike, consider a sun-powered way to maintain your car's battery. If you're more likely to go fast than sits still, check out the all-electric race car from Greenstage (above, left). AutoblogGreen also brings you more coverage from the Austin Alt Car show.