2006 GMC Sierra EPA Fuel Economy Ratings

A comparison of fuel economy ratings for 2006 GMC Sierra trucks. Use the figures to compare trucks in a class, but remember that your actual gas mileage will vary.

2006 GMC Sierra Trucks - 2WD

• 6 cylinder, 5-speed manual, 16 city / 22 highway

• 6-cylinder, 4.3L, 4-speed automatic, 16 city / 21 highway

• Sierra Hybrid, 8 cylinder, 5.3L, 4-speed automatic, 18 city / 21 highway

• 8 cylinder, 4.8L, 5-speed manual, 16 city / 21 highway

• 8 cylinder, 4.8L, 4-speed automatic, 16 city / 21 highway

• 8 cylinder, 5.3L, 4-speed automatic, 16 city / 20 highway

• 8 cylinder, 5.3L, 4-speed automatic, FLEX-FUEL
  • Gasoline: 16 city / 20 highway
  • E85: 12 city / 16 highway

• 8 cylinder, 6L, 4-speed automatic, Premium gas, 14 city / 19 highway

2006 GMC Sierra Trucks - 4WD

• 6 cylinder, 4.3L, 5-speed manual, 15 city / 20 highway

• 6 cylinder, 4.3L, 4-speed automatic, 15 city / 18 highway

• Sierra Hybrid, 8 cylinder, 5.3L, 4-speed automatic, 17 city, 19 highway

• 8 cylinder, 4.8L, 5-speed manual, 15 city / 19 highway

• 8 cylinder, 4.8L, 4-speed automatic, 15 city / 19 highway

• 8 cylinder, 5.3L, 4-speed automatic, 15 city / 19 highway

• 8 cylinder, 5.3L, 4-speed automatic, FLEX-FUEL
  • Gasoline: 15 city / 19 highway
  • E85: 11 city / 14 highway

• 8 cylinder, 6L, 4-speed automatic, Premium gas, 14 city / 17 highway

2006 GMC Sierra Trucks - AWD

• 8 cylinder, 6L, 4-speed automatic, Premium gas, 13 city / 17 highway

GMC recommends regular gas for all Sierra trucks unless noted otherwise.