Originally Posted by kdogg85
How do those mileage calc's work anyways? Do they look at fuel tank drop vs tire revolutions or look at fuel being commanded to the injectors for hours ran or something else? I always wondered.
To the op, with a 40-50* delta, you had one very well built egr cooler assuming it didn't bust and that was the reason for the delete.
It will take a tad longer for the engine to warm up since the exhaust gas is gone and the 6.0 isn't very fuel friendly when cold. That may be some of what you are seeing as well.
Originally Posted by powerstrokesmoke96
Yes I was scared to drive the thing with a delta that bad but it never rupture, I heard the 03 and 04 egr coolers are stronger than the newer ones. Now my delta stays right around 12*. is that common to lose mpg after an egr delete?
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The reason is that he has an 03 and they almost never loose an EGR cooler. They are built more like the BPD cooler. The later design they changed to is a better heat exchanger but a weaker design.
And as my other post explained anybody deleting the egr system whill loose fuel mileage and see elevated EGT's. It's simple physics.
kdogg I don't know how exactly they calculate fuel mileage but I've seen them be really close and wildly inaccurate. When I put the PHP FICM on my lie-o-meter went down by 5 mpg or so in spite of the fact I actually picked up a couple mpg.