Great Lakes Discussion, 01 STS gas mileage problems in Cadillac Clubs, Local Chapters and Regional Forums; Recently purchased a 2001 STS with 80k miles. Car is in excellent condition in and out. Factory 17 inch wheels, ...
- 02-26-08 08:54 PM #1Cadillac Owners Member
- Automobile(s): Cadillac 01 STS
- Join Date
- Feb 2008
- Mid Michigan
01 STS gas mileage problems
Recently purchased a 2001 STS with 80k miles. Car is in excellent condition in and out. Factory 17 inch wheels, runs and drives very nice. Info I have found indicates highway mileage is 27 mpg average. Have changed plugs, and air cleaner, best mileage to date is about 22.5 with cruse set at 74. I do see the occasional P0420 code indicating 0s sensor or cat converter. Any suggestion?
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