The more weight the engine has to move, the harder it works, and the more fuel it uses.
NO. It has NOTHING to do with the MPG.
Yes it does. At optimum pressure you get better mpg
100 mpg I remember seeing around 100mpg depending on the weight it carries.
Weight does not affect soil absorbency.
It lowers your mpg
It slows it down, and causes MPG to drop.
No, an electric current does not affect weight.
depending on the truck, the weight of cargo etc . the fuel milage can be anywhere from 4 mpg to about 9 mpg
25 mpg loaded with 1 ton weight, and not driven gently. Mixture of town and country driving.
To increase mpg by eliminating weight. The vehicle weighs less than 1000 lbs and gets up to 70 mpg.
Too many unknown variables to answer. You don't state the MPG figure for the van and, additionally, the weight of the passengers would affect the final figure.
As the weight of a vehicle drops the mpg improves.