OT-Looks like GM isn't real popular for fuel mileage.
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2000 Z-71 - 5.3 - 285 hp gets 17 hwy
2002 Gmc Denali 6.0 - 320 hp gets 16-16.5
2002 Gmc Duramax 19.1
2001 Ford Excursion Powerstroke gets 15.8
2002 Ford F150 - 5.4 - 260hp gets 16
all driven dailey by myself, wife and the crew
2002 Gmc Denali 6.0 - 320 hp gets 16-16.5
2002 Gmc Duramax 19.1
2001 Ford Excursion Powerstroke gets 15.8
2002 Ford F150 - 5.4 - 260hp gets 16
all driven dailey by myself, wife and the crew