Originally Posted by 
Brian Hjelm
				
			 
			I spent a little time in the US in a winter and some of the truckers from the snow belt had plumbed a pipe about 1 1/2" - 2"  diameter into the exhaust stacks and ran it to blow hot gases onto the bottom of a fuel tank at the outlet fitting. Much like ships run exhaust gases through pipes in the fuel bunkers to liquify the low grade muck they run on. I loved the electric outlets on posts in the parking lots at truck stops, like the speaker stands at drive-in theatres, to plug block heaters into whilst parked.
 I once used to sell a range of earthmoving equipment made in Minnesota and the standard equipment included a 110 volt block heater and lead.