I had mine on since i got it (1200 miles ago) and am averaging 11.7. Still giving it a little extra cuz i like the way it sounds
Rich
2004 H2 Adventure w/Corsa cat back.
2003 Nisan Murano
2003 Lincoln Navigator (for Sale)
2001 Ford Lightning W/mods
1999 F-350 W/mods
1999 Yukon Denali (for sale)