Very good info from K-I-S.
I used 56 LPH for longer range flying the PA-30B or C, and flight planned on 150 KTAS for very conservative numbers. They fly a whole lot better with weight spread through the cabin.
Can I recommend anyone thinking about range and endurance in the PA-24 and PA-30 Comanches read Into the Wind-The Story of Max Conrad by Sally Buegeleisen.
Conrad, (1903-1979), was a contemporary of Lindberg and other pre WW2 aviation legends. He died with over 50,000 logged flight hours in his logbook. He made 150 ferry flights over the Atlantic, and 30 over the Pacific.
He recorded a PA-24 flight of over 58 hours airborne, and a PA-30 flight of 6,830 nm from Capetown to Florida. Some of his fuel miserly flights in Pipers are still world records. He was recognised by several prestigious awards, and is considered one of the greatest ferry pilots of all time.
happy days,