I just hit 3,000 miles and my last tank was 19.6MPG 80% highway @ 75 20 % construction site and town, the overhead was showing 18.4, the previous tank was 18.8 with 50% Highway the other 50% was back roads, the overhead was 17.7. I am happy.

All hand calculated.

 

The engine breaks in at 50,000 miles, but your current milage is great!

 

I fillled mine up last night I have 2000 mi. now.
13.36 By the math
14.1 On the computer overhead
About 200 mi was towing a 4000# boat
The rest was around town

I'm waiting for mine to improve a little bit,
Ihope it does.