Current Issue

Truck Fuel Economy Factors


Updated February 2009
RankIf You Use
or Have ...
VSPercent MPG Improves
1 Routes Flat interstate highway Urban route, 100% stop-and-go 45-165%
2 Routes Flat interstate highway Suburban route, 50% stop-and-go 25-35%
3 Drivers Best drivers Worst drivers Up to 35%
4 Speed with poor aerodynamics If you go slower by 5 mph No change 10-15%
5 Cooling fans with on/off types Zero fan on time 100% on time 7-18%
6 Routes Flat interstate highway Mountainous interstate 4-18%
7 Engines Electronic Mechanical 7-15%
8 Weather conditions Summer Winter 8-12%
9 Tires Steer/Drive/Trailer; Rib/Rib/Shallow rib Steer/Drive/Trailer; Rib/Deep lug/Rib 6-14%
10 Weights: Mountainous route 10,000 lbs. lighter load (for gross vehicle weight between 60,000-80,000 lbs.) Heavier load 7-12%