Found it!

Okay, here are the final numbers from our trip. This includes five days of travel. They were: Ventura to Las Cruces, Las Cruces to Dallas, Dallas to New Orleans, New Orleans to Jacksonville, and Jacksonville to New Bern.

Total hours driving: 50:28
Total miles driven: 3281.7
Average miles per gallon (Audi): 27.5
Average miles per hour: 64

Whew.