Energy Efficient Vehicle

While driving in Pennsylvania, a family caught up to an Amish carriage.
The owner of the carriage obviously had a sense of humor, because
attached to the back of the carriage was a hand printed sign...
"Energy efficient vehicle: Runs on oats and grass. Caution: Do not step
in exhaust."

 

I wonder, how many miles per "exhaust".

 

Hee hee. From the exhaust left on some of the back roads here...I'd say the ratio is pretty high.

 

And he dosn't have to worry about "tailgaters" either!