I've also heard it was really hard on engines, due to the acids present in
the gas and particulates from the burning process.

             _ _
  __ _ _   _| | |  | David M. Brodbeck (N8SRE)              Ypsilanti, MI
 / _` | | | | | |  +-----------------------------------------------------
| (_| | |_| | | | @ cyberspace.org
 \__, |\__,_|_|_| "Geekdom is fantastic at being AGAINST something, and
 |___/             it's hopeless at being FOR something."
                                      -- Andrew Orlowski in The Register.