Below are some yearly average statistics for a 2004, 6.0, Chevrolet 3500 extended cargo van. This van was put into service April, 2004. It replaced a 1998, 5.8, 3500 extended van. The stats for 2004 include both vans with Jan, Feb, March and part of April for the 1998 van. Until sometime in 2008 my typical freeway cruising speed was 67 mph. Since then my average freeway cruising speed is 63 mph. Yeah, it took me a long time to realize slowing down would save me money. In 14 years I have had one service failure and that was due to a breakdown. In most cases I arrive to the consignee 1 to 3 hours early.
2004 mpg 15.89 ppg $1.76 ppm $0.11
2005 mpg 16.50 ppg $2.16 ppm $0.13
2006 mpg 16.39 ppg $2.42 ppm $0.15
2007 mpg 16.29 ppg $2.70 ppm $0.17
2008 mpg 16.54 ppg $3.08 ppm $0.19
2009 mpg 17.07 ppg $2.24 ppm $0.13
2010 mpg 16.94 ppg $2.67 ppm $0.16
2004 mpg 15.89 ppg $1.76 ppm $0.11
2005 mpg 16.50 ppg $2.16 ppm $0.13
2006 mpg 16.39 ppg $2.42 ppm $0.15
2007 mpg 16.29 ppg $2.70 ppm $0.17
2008 mpg 16.54 ppg $3.08 ppm $0.19
2009 mpg 17.07 ppg $2.24 ppm $0.13
2010 mpg 16.94 ppg $2.67 ppm $0.16