2007 Allegro Open Road 34TG Diesel, FRED. FRONT ENGINE DIESEL. This 2007 Allegro Open Road 34TG is hard to come by. The front engine diesel FRED gives you lots of climbing power while you save fuel. Great MPG.This Diesel motor home is loaded with all you want and then some. The Tiffin Allegro name has a great reputation in the RV industry and that is evident in the quality in this motor home. Please see all notes on the pictures. Come in and test drive this wonderfull motor home and you will be pleased.