Quite honestly, I have reached 29.3 mpg on highway travel at about 58 mph using cruise control. Higher speed then will reduce the mpg to about 65mph. After that it drops much faster. This is on flat, open highway. Mileage around town usually around 12 - 13 mpg.
The BMW 740iL has a fuel tank capacity of approximately 21.1 gallons. The actual fuel consumption can vary based on driving conditions, but it typically averages around 15-20 miles per gallon. Therefore, the range per tank can be around 300-400 miles, depending on driving habits and conditions.
2010 BMW 528i Fuel Efficiency: City 18 MPG; Hwy 28 MPG
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It goes about 60 miles per gallon.