The converted all the taxis in Bogota, Colombia to natural gas as well. You can convert a car there for $500. A taxi can go about 60 miles/100 kilometers at a time, which means they fill up 3 times a day - but it's 1/5 of the price of gas. And it's done right at the gas station. It 's at the gas station here in the States as well, though not as popular. The BP station at Newark Airport has one, right next to the gas pumps.
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