Drove from Utah to Montana on June 25th. Total one way 673 miles. Filled the car with 91 octane and reset trip 1. Filled car with premium all the way. Upon arrival, I filled the car again and logged the following:
Total Fuel: Extactly 18 gallons.
Avg Speed: Between 75 and 78.
Weather: between 75 and 85 degrees.
Elevation between: 3000 to 4000 feet.
Display read: 36.8 MFG
1.6% differance between display and actual.