I am getting 23-24mpg hwy out of the V8 ,my edge would barely get 23 open hwy. all city is 17-19 still havent got a bed cover, that will be income tax time purchase. I put a K&N on it the next morning after driving it home. I looked at the Borla but the cost is quite prohibitive. I have never looked at gas mileage to determine a purchase, and I drive about 500-700 miles a week some times. its been just over 2 weeks and Im at 2400 miles. work has been out of town the last 2 weeks.