Raoul,
I think we are missing some factors in the equation. The main one being drag coefficient. If your payload is aerodynamic then your MPG does not go down as much even though it may weigh a lot. Consider two payloads:
1. A 4'x4'x4' cube weighing 1800 lbs.
2. A 4' diameter sphere weighing 1800 lbs.
The sphere is more aerodynamic so your MPG would decrease at a lesser rate than with the cube.
But the spray-in bedliners are not as smooth as the factory bed with those aerodynamic grooves in the floor. The spray-ins are actually bumpy, so that may reduce the MPG even more. Geez, I may have to get my physics book out for this one!
I say if all else fails just drive the truck until the little light (I think it is called an idiot light) tells you that you need gas.
[This message has been edited by BlueFlareside (edited 06-20-2001).]
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