Attention: TDR Forum Junkies 
Last week when my catalyst 90% came on I drove truck 8-10 miles on interstate and got message down to 70%. Overhead was averaging 9-11mpg. Went into dealer today and he looked at duty cycle and catalyst was on about 30% when he cranked on regen. We drove about 38 miles at about 75-80mph and regen kicked off when it hit 19%. On the way back overhead averaged 13-14. 5mpg.
Go figure.
Go figure.
