  In this paper we address the question: To what extent is the quantum state
preparation of multiatom clusters (before they are injected into the microwave
cavity) instrumental for determining not only the kind of machine we may
operate but also the quantitative bounds of its performance? Figuratively
speaking, if the multiatom cluster is the "crude oil", the question is: Which
preparation of the cluster is the refining process that can deliver a
"gasoline" with a "specific octane"? We classify coherences or quantum
correlations among the atoms according to their ability to serve as (i) fuel
for nonthermal machines corresponding to atomic states whose coherences
displace or squeeze the cavity field, as well as cause its heating; and (ii)
fuel which is purely "combustible", i.e., corresponds to atomic states that
only allow for heat and entropy exchange with the field and can energize a
proper heat engine. We identify highly promising multiatom states for each kind
of fuel and propose viable experimental schemes for their implementation.
