Took a road trip in the truck up to Novar, ON- 500 miles round trip. MPG roughly at 20. Since then, city driving mpg is at 21. Awesome truck. Great investment. Superb comfort and build quality. GM has a winner in the hybrid truck market.
The best we got driving to work everyday, 150 miles round trip daily, was average 18 mpg. Quirky silly and annoying driveline. Base 1980 style interior, jarring ride, poor assembly quality. GM needs to take some lessons from the Japanese.
Still has good cargo room in rear, good interior room, air conditioning works well.
Herky jerky drive system has no similarity to the Japanese or Fords hybrid systems. We sold this think to a EcoFreak and bought a new F150, which still gets better mileage than this overpriced Chevy, and the Ford was $10,000.00 less, completely equipped with nice interior and all the options.
I searched for consumer reviews of this vehicle but they are few and far between, so...here is mine. So far (1300 miles) the truck has been just about perfect. Overall fuel economy, which includes towing a small boat, is 18.6. Biggest thing to get used to is the "Uh-oh" feeling at stoplights when you think the motor has stalled. There are some small stutters switching back and forth between electric and gas propulsion, but nothing too noticeable. Comfort is great, cornering is quite good, all controls are user friendly. Acceleration is great. One small problem, common among Silverados, I hear, is that the tire monitoring system was flashing a warning due to some computer glitch--fixed.
Mileage, cool hybrid features, ride, seat comfort(except for useless lumbar support in the 6-way seat) space, fit and finish.
Grips/handles above windows for driver and front passenger; better, less "muddy" radio; flashier hybrid instrument/gauges, like Prius.