Made a run from CA to Denver to pick up a car for my dad....averaged 23 empty heading out there about 18 so far on the way back....

That is pretty darn good. Was that hand calc'd? I've read where the evic only records the last 200 or 300 miles in displaying the avg mpg. That's why if you've left the trip B as a lifetime mpg marker, as I have, it's always very very close to a tanks worth mpg.The entire round trip 2,004 miles averaged 19.3 mpg not too bad considering I was towing approximately 6k lbs back...
Any knowledge on the amount of miles the evic can use to determine mpgs?Hand calc came back 19.22 evic said 19.3...I have trip A as life time and reset trip b each trip and also it started a towing trip as well since a trailer brake trailer was connected.