Hi Donald,

My conversion table [Pocket Ref by Thomas J. Glover, no desk is complete without a copy!] lists your conversion number under "gallons (US dry)" while my number came from the entry for "gallons (US liquid)."

Since I work on motorhomes with engines, fuel tanks, waters tanks and such, I've always used the liquid gallon variety. I really can't say that I've ever seen anything labeled in dry gallons...

FYI: US dry gallon = 268.8 cubic inches
US liquid gallon = 231 cubic inches

Dennis