OK, I have over 6,000 miles on my EcoDiesel. Went on a long trip this weekend to Cape Cod, 787.7 miles. Filled it up with diesel today just after the low fuel light came on. 24.097 gallons filled it to overflowing. 32.77 mpg. The EVIC showed only 31.1 mpg. Tomorrow, putting her on a Mustang Dyno and finally installing the GDE Hot Tune. Oh, part of this tank including towing a 2,000 lb trailer! So,I'm hoping to get even higher numbers with the Hot Tune. Also will be doing an EGR Delete. If I'm happy, may do a complete Delete of the DEF BS. BTW, amazed how clean the inside of the tail pipes are compared to the hemi! Shiny clean.