How do the Amish compress the air Grigg?
Can't speak for Virginia Plain communities, but around here, most of my Mennonite neighbors use Deutz air-cooled diesels to power their compressors and hydraulic pumps. Still a few Detroits in the 'Hood, but mostly, the two-cycle diesels have given way to the air-cooled 4-cycle engines as the Detroits wear out, become harder to maintain, use more fuel, etc.
Across from our (now former) farm, is (was) a furniture maker and he had a 2,000 gallon tank off on old propane delivery truck as his storage tank. His engine is a 3-cylinder Deutz. Powers both the air compressor and the hydraulic pump. The hydraulic pump powers his wood working equipment (lath, band saw, table saw, band sander, planer, etc). The air is for a few hand tools and the well pump. Most of the plain communities around here have drilled wells with a compressed air-powered well pump. It's pretty neat.