Compression Ignition Addict
Join Date: Oct 2010
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I really think that is an old wives tale from when diesel were not as precisely built.
I have not seen a significant increase in fuel mileage because of break in with the last 4 trucks I've bought. I buy new and drive 100,000 miles and then trade off. So unless this mileage increase comes after 100,000 miles, I just have not seen it.
The new technology of the 6.7L engines, The CGI block etc, Just does not require long periods of operation to break in.
I suspect that as your DPF and other emission equipment age, ( or get clogged) you will see a slight reduction in mileage. Hence the reason some folks see a slight increase when they delete.
2015 F350 CC SRW LWB Lariat, Leveled, BAKflip, Ultra Predator wheels with Toyo A/T 295/65R20, Firestone Airbags and onboard compressor
2011 F350 CC SRW LWB Lariat - Gone
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