Has anyone heard of using an insert into the heater hose line to heat gas before injection into the engine? A friend has bought one and will have it installed shortly. It looks like a tube for the hot water to flow through with a line wrapping tightly around it ( maybe 8 coils ), everything made of copper. The main tube looks to be about 5/8 or 3/4 inck diameter with nipples on both ends( for the heater hose ), wrapped with 1/4 or 3/8 tube for the gas. Would preheating gasoline do anything ? ??? Thanks for any thoughts.