On Wed, 02 Jul 2008 04:08:10 -0400, Pogo rearranged some electrons to say:
> Just bought a new F250 CrewCab 5.4L 4x4 Super Duty. I have read the
> manual and it says not to Tow for the first 800 miles or so. I have
> babied my baby as I want this truck to last me ~ 15years.. I now have ~
> 800miles and I noticed my fuel economy sensor report an initial 8.4mpg
> and as peaked to 12.2mpg and then drifted back to 11.8mpg. My question
> is at what point (miles) is an engin considered broken in! realisticly,
> does this break-in mean that I have reached my best fuel economy?
> What is the norm for this vehicle in the way of bext fuel mpg.... don't
> mis-read..I am not bitching about my fuel economy, I know I bought a gas
> hog...this is a new vehicle and would like to gauge at what point my
> engin has seatled in so that I can commence towing without affecting
> it's efficiency for the long term.
>
> P.S. Any special driving habit during the breakin period that will
> improve the motors long term performance.
>
> Pogo
Follow what the owner's manual says, and you can't go wrong. Typically
they will tell you to drive at different speeds during this period. It's
not efficiency that you're worried about, it's making sure the piston
rings get a good seal against the cylinder walls.
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