BOISE, Idaho -- A Boise taxi cab company is revamping its older model cars to run on bio-fuel that comes from the oils used to make french fries.

The Boise fry company gives about 300 gallons of used oil to the cab company every month in exchange for advertising on the cabs.

For some companies, getting rid of used oil can be costly.

"Whenever I realize these cars are as reliable as they are and they could be used in such an eco friendly way, that's what spawned the whole concept," said owner James Orr.

In just one year he says the cab will put out 30,000 fewer tons of CO2 than a normal cab running the same amount of time.

The new fleet is expected to hit the streets next month.