Breakin in at 10K miles

[Scooby]

According to the manual, the newer trucks have a controlled break in period determined by the trucks computer. I don't recall if I read the mileage intervals at which this happens or if I just heard where folks thought it happened, but I swear that after hitting just a hair over 10K miles last week, the engine feels "looser". It seems to rev a little quicker and just seem a little quieter. Don't know if it's in my head or not - anyone else notice this after 10K miles?

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'01 2500 SLT+, QC, LWB, 4X4, 3. 54s, AT, SPA guages, Alpha Liner,DTT VB, SnugTop XV shell with BedRug, Grovers, Roadmasters... every option but running lights!

'98 DUCATI ST2 "Bombed" 944CC with Ducati Performance Carbon Fiber Exhaust, F. I. M. Chip, K&N and "modified" air box.

 

[TowPro]

I drive all highway mileage, with some towing 10K lbs about once per month. I noticed my MPG keep going up until around 20K!

Originally posted by Scooby:
According to the manual, the newer trucks have a controlled break in period determined by the trucks computer. I don't recall if I read the mileage intervals at which this happens or if I just heard where folks thought it happened, but I swear that after hitting just a hair over 10K miles last week, the engine feels "looser". It seems to rev a little quicker and just seem a little quieter. Don't know if it's in my head or not - anyone else notice this after 10K miles?