With the coming of colder winter temperatures
two Dodge enthusiasts could get together
and do a careful MPG test with two trucks 'convoy' style
in a circular highway trip.
On the first circle of the trip one truck would remove its clutch fan blades (put clutch back in place). At the end of this first stage both trucks would fill up and check their MPG.
On the second stage of the trip, the first truck would put its fan blades back on, and the second truck would take the fan blades off and both trucks would repeat the circular trip.
If two friends were going to a football game out of town, for example
this would be a good opportunity to do a test.
The effect of fans is small
and it takes a careful test to find out something you can trust.
This double truck testing is the way pros do it,
such as the way Goodyear tested its new tires before witnesses in Texas
at the end of this article: