I just finished a load of straight dino diesel that gave me about 26-27 mpg and that was with my little pig-cart trailer behind the car for about 50% of the tank. I generally get about 23-24 mpg and, depending on the load on the trailer, may dip down to 21.

The engine seemed to idle about 100-150 rpms faster and, there was a decidedly distinct klatta-klatta that hasn't been present with prior tanks or, the load of fuel I'm presently carrying. However, I couldn't detect any difference in acceleration or how much throttle it took to maintain a specific speed.

Anyone else here ever encounter this phenomon?

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Never a dull moment at Berry Hill Farm.