2006 GMC Sierra 15 Hybrid 4WD MPG & Specs — Real Fuel Cost
Quick answer
The 2006 GMC Sierra 15 Hybrid 4WD gets an EPA-estimated 15/18 MPG (city/highway) and 16 MPG combined, with an estimated $3,850/year fuel cost and 555.438 g/mi CO₂. Engine: 5.3 L 8-cyl.
The 2006 GMC Sierra 15 Hybrid 4WD with the 5.3-liter 8-cylinder regular gasoline engine returns an EPA-estimated 15 MPG in the city and 18 MPG on the highway, for a combined 16 MPG. This page summarizes the official EPA fuel-economy and emissions data for this configuration.
| Engine | 5.3 L 8-cyl |
| Transmission | Automatic 4-spd |
| Drive | 4-Wheel or All-Wheel Drive |
| Fuel type | Regular Gasoline |
| Vehicle class | Standard Pickup Trucks 4WD |
| MPG — city | 15 |
| MPG — highway | 18 |
| MPG — combined | 16 |
| Annual fuel cost* | $3,850 |
| CO₂ tailpipe | 555.438 g/mi |
| EPA GHG score | — |
How efficient is it?
With a combined 16 MPG, the 2006 GMC Sierra 15 Hybrid 4WD sits in the low range for fuel economy. That is roughly 24% thirstier than the typical Standard Pickup Trucks 4WD of its era (21 MPG class average) — expect higher fuel bills than class-average alternatives.
Fuel economy and running costs
At about $3,850 per year in fuel (EPA estimate, 15,000 mi/yr), fuel is a major part of the cost of owning the 2006 GMC Sierra 15 Hybrid 4WD. Over five years that is roughly $19,250 at today's prices — before insurance, maintenance, and depreciation.
Emissions
The 2006 GMC Sierra 15 Hybrid 4WD emits approximately 555.438 grams of CO₂ per mile at the tailpipe. Lower emissions generally track higher fuel economy.
How to read these numbers
EPA figures come from standardized laboratory test cycles and are the same estimates shown on the vehicle's window sticker. Your real-world mileage depends on driving style, conditions, fuel grade, and maintenance. Use combined MPG and annual fuel cost to compare vehicles fairly.