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JL8Jeff · 08-08-2007, 05:02 PM

If you're getting 23 mpg on the highway with an LT1 with an A4 then that's about what I would expect. My 93 with the supercharger got 24-28 but my 96 SS got 23 mpg and my 00 SS is getting around the same on the highway. I noticed my bank 1 post cat O2 sensor wasn't reading anything for the first minute today. Then it would go up to 750-850 and stay in that range pretty constantly. The bank 2 post cat sensor was generally up in the 750-850 range but would drop back down as low as 150 when coasting at times. My exhaust doesn't smell right so I think I have on O2 issue as well.

08-08-2007, 05:02 PM	#19
JL8Jeff Hippy Mod, Bergermeister Meisterberger, Moderator Join Date: Aug 2004 Location: Ewing Posts: 6,216 iTrader: (3)	If you're getting 23 mpg on the highway with an LT1 with an A4 then that's about what I would expect. My 93 with the supercharger got 24-28 but my 96 SS got 23 mpg and my 00 SS is getting around the same on the highway. I noticed my bank 1 post cat O2 sensor wasn't reading anything for the first minute today. Then it would go up to 750-850 and stay in that range pretty constantly. The bank 2 post cat sensor was generally up in the 750-850 range but would drop back down as low as 150 when coasting at times. My exhaust doesn't smell right so I think I have on O2 issue as well. __________________ 69 Z28 JL8 4 wheel disc brakes - being restored 09 Silverado Z71