Fuel economy for KHK?

[Coolbreeze]

How many mpg should I be getting with my '56 KHK when driven at 60+ mph over a long distance?
Seems like I got ~25mpg the last trip I took. This looks a bit low. My Chief gets 35 mpg. Is it possible that the float is set wrong and that it is dumping gas into the engine?

[T. Cotten]

George!

If your float is of proper buoyancy, then there is only one float setting: 1/4 inch.

If performance seems unimpaired, but far too much fuel is being used, it would suggest that it has been enrichened to accomodate extra air from a vacuum leak.
I suggest bubble-testing your intake manifold assembly, as discussed at http://virtualindian.org/11techleaktest.html for certainty.

A #9 rubber stopper works as well as a testplate, although it requires three hands.
A stopper is the only way the individual nipples into each cylinderhead can be tested separately.

Good luck,

....Cotten