My recently acquired '84 Westy was getting about 275 miles per tank of gas (the
needle was just dipping into the red section when I refilled).  Now on the same
tank of gas, I'm already in the red section at 145 miles.  Any thoughts as to
why my fuel mileage would drop so substantially?  Is it possible that the fuel
guage is faulty?  I checked the tire pressure and its set at 38psi in front and
44psi in the rear.  Also, the exhaust does not smell overly like unburnt fuel.

Any thoughts are much appreciated!

Ryan