I put on a borla cat-back ('05 S'crew, 4.6) almost 3 weeks ago and today was the first chance I've had to get out on the highway for a decent drive. Topped off before I got on the highway and 142.5 miles later @ average of 70mph, filled 'er up again, 7.00 gallons.. 20.35 mpg. Previous best was 18.55.. I know it's not that much, but it's makin' me smile , broke out the maker's mark for a sip or three.. my gf doesn't get it, what's the big deal??.. her and her Jetta.. lol..

next step run it as close to dry as I dare I reckon.. lol.. see what this 30 gal. tank does now..