'Go Green, Save Green' Auto Loans?

(Excerpt)
Cromer pitched the idea to his staff who created Envision's "Go Green, Save Green" loan product that reduces the vehicle owner's annual percentage rate (APR) by 1%. During a 36-month obligation, drivers will save close to $700 on a $20,000 loan. Drivers will qualify for the new "Green Rate" when they agree to buy a vehicle with mileage of 30 miles per gallon or higher. (Read more about this story here)