bligh wrote:
Hi, I searched for a while but found no cost comparisons.

Do your own.

Propane contains about 15,000 BTU's per pound and a U.S. gallon weighs
about 4.25 pounds.

Diesel contains about 21,500 BTU's per pound and a U.S. gallon weighs
about 7 pounds.

Obtain your local prices and do the math.

Rick