I had a '21 LM2 and now a'23 LZO
I don't put much faith in estimating def usage per segment.
All def added as been from a metered pump, and when def is added the tank gets filled so I can do def mileage calcs the same way as fuel mpg.
The truck is using def at the expected rate of 2% of fuel (2 gal def per 100 gal fuel). The older truck, and the 6.6's I ran before were all very close to the 2% of fuel usage rate.
Lifetime average currently 1380 miles per gallon. (first 24,734 miles)
My question would be how does the fuel economy / fuel used during the trip compare with the previous truck?
It it used more fuel -- speed, headwind, ac running hard due to highe temps, etc -- then it should use more def.