The EPA figures for the two vehicles, and which are the basis for the brochure, are very theoretical. They are measured on a test cycle, and then adjusted by a correction factor. No vehicle actually achieved the published number. Check out the test methodology. The numbers are based on a test cycle which:

• is on a dynamometer, which does not account for the vehicle weight difference
• is at a pre-programmed acceleration rate (which is the same for both vehicles) that is very slow, thus not using any of the V8's hp advantage
• is so slow that the additional top gear doesn't come into play

That is why the theoretical figures are the same, and why I call them theoretical. It is easy to check, look and see how many members in the real world are getting the same mileage on the two vehicles. Sure the V8 has more hp. But if you take advantage of it (which burns more fuel, that being how power is created....) you won't get the same mileage as the I6.

So, your FACTS are theoretical, and not available in the real world. But they did help BMW sell more vehicles.

No argument that the V8 is faster.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue