I think I lost as much as 5 mpg with the avid envigors in oem size. BUT, BUT, BUT, the traction well made up for it. I had a deer jump out in front of me at 70 mph on i295 one night. I twisted the steering wheel and swerved a lane over and back with no problems. Ive also driven around in the snow n ice in Richmond the past few winters with no problems. I did have problems this winter, but I also got 2 tires that need to be replaced. True this is my second set in 2 years, but I am driving like I stole it.
Down side I cant do a screaming burn out. I got the touring s on my sidekick and I can do a mini burn out, then it grips.
