Usually souped-up street rods are created by teenagers. But if you’re an engineer, you can convert your Prius into a 250mpg super-miser by adding a few more batteries and plugging it in overnight. This extra energy costs less than twenty-five cents a day. And Ron Gremban lives in California, where hybrids can now use the car pool lane, even if only one person is in the car.
Gremban customized his Prius by adding 18 batteries to the trunk. It cost only about $3,000 to do the job. The Prius increases its fuel efficiency by using the small amounts of electricity created by braking and coasting. The extra batteries let Gremban store even more power by plugging the car into a wall outlet in his garage.