The cut gas push lawn type

In http://able2know.org/topic/321689-1 I advise Barry on the compound adjective when coincidentally in today's Lowe's flier I encountered a Cut Gas Push Lawn Mower

"Cut Gas," I guessed, refers to new easy-start engine that would be more economical for "...easy and reliable starts"

The secret is in a "21-in.," mod which somehow my 85-year-old mind refused to register. So it was several days encountering the ad before I realized it executes a "...21-in. Cut..."