The day before is unlikely to be helpful.

My 98 took 3 weeks to clear the P1000....

FWIW, the cat efficiency codes won't cause the PCM to go into any mode that uses more fuel.....

Steve

98 Contour SE Sport 2.5 Duratec ATX The wifey's car 89 Taurus SHO - 246K miles 94 SHO ATX - 190K 1997 F-150 5.4L ATX - The Workhorse 150K. ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!