4.3,5 speed, 3.23 gears, A/C off, highway driving. It's also a stripper truck, the only weight adding option is the A/C. I calculate it as KM/L x 2.82
The 28 was a one time thing, perfect conditions driving a little better than reasonable, I average 26 and got as low as 19 at one point (cheap gas and a heavy foot)
Since I can't afford to knock on 11's I get a little amusement out of trying to make it as efficient as I can, once I can hit 30mpg the V6's life in the truck is over.