If gas mileage is a key factor for you, consider a 428i. I have a 328i that gets 24 in town, 34 on the highway in comfort mode, and up to 38 on the highway in eco mode. If you are looking at the N55 inline 6 because your current 4-banger does not give you the performance you want, don't underestimate the N20.
2002 BMW X5 4.6is 4.6L V8 GAS Automatic 5 Speed Sport Utility Korucu BMW. 2002 BMW X5 DIESEL A simple & effecive way to track fuel consumption
Annual Fuel Cost* $3,650: Cost to Drive 25 Miles: $6.11: Cost to Fill the Tank: $99: Tank Size: 22.5 gallons *Based on 45% highway, 55% city driving, 15,000 annual miles and current fuel prices. Personalize. MSRP and tank size data provided by Edmunds.com, Inc. Range on a tank and refueling costs assume 100% of fuel in tank will be used before
Highway MPG: 19. highway. 6.2 gals/100 miles. Unofficial MPG Estimates Shared by Vehicle Owners. View Estimates.
X5 Diesel. 2016 BMW X5 xDrive35d 3.0L L6 DIESEL Automatic 8 Speed Added Aug 2016 • 339 Fuel-ups. A simple & effecive way to track fuel consumption No other Diesels in the U.S. perform like these BMW Advanced Diesel models. Coupled with this performance potential is impressive fuel economy. The EPA mileage estimates for the 335d are 23 City and 36 Highway – the best figures ever achieved by a road going BMW in the U.S. The X5 xDrive35d is rated at 19 mpg City and 26 mpg Highway. . 669 759 458 554 511 864 857 120

fuel consumption bmw x5 3.0 diesel