Arizona republican., 1919-07-20

barely enough for our deir ands now with still heavier consumption in prospect
 The first place to begin the cam paign to cut down fuel consumption is at the carbureter. Here occur most of the leaks that increase fuel con sumption. The average American car owner drives with mixture nearly twice as rich as is necessary In oth- er words almost half the gasoline that he uses is wasted The modern eli- zine will run on a mixture ranging from about fourteen parts air to one of gasoline to one containing only eight parts air to one of gas. But the engine will do it's best work when the mixture is made as lean as possible. While it burns the heavier mixture it does not operate with the snap and vim that it displays on the leaner fuel.
 Practically all modern carbureters have an attachment for increasing and decreasing the amount of air injected into the mixture It is very simple matter to experiment with this adjust ment, first making the mixture as lean as possible and gradually turning back until exactly the right proportions of
  factory operation. In addition to the benefits of greater economy with the leaner mixture this condition also cuts down carbon deposits.
 It may seem to the individual car owner that it is a very small matter whether or not he uses too rich mix ture but it is the aggregate of this wastage that counts The individuals eto ho y,1ttI4iplind hKr a,.1v- 5000 900 to get the total amount of motor fuel that is practically thrown away If all this potentially useful fuel were turned into actual serWce. instead of having our fuel supply an alarmingly tight fit for our needs, we would have d handsome surplus to take care of the rapidly growing num- bers of motor vehicles.
 However, the carbureter is not the end of the search for possible fuel leaks. After the carbureter has been properly adjusted to supply the lean est mixture consistent with good oper- ation, the whole fuel system ought to be gone over from engine to tank Foreign matter partially obstructing the pipes. or lodged in the strainers. or in the fuel tank, helps to cut down the efficiency of the whole system. A rigid search for leaks in pipes and manifolds should be instituted Small leaks are peculiarly liable to escape notice in warm weather when the gasoline is lighter than in winter and quickly evaporates after escaping into the air. Obviously actual leakage of the fuel is one of the best possible ways to increase consumption
 An actual physical leakage of the fuel is only a little worse than power leaks of various sorts. Wasted power inevitably means additional fuel to make good the deficiency. Carbon de- posits in the cylinders are a prolific source of wasted power. And here is a place where one original waste breeds further wastage. When the fuel mix ture is too rich. heavy carbon deposits are formed in the cylinders and these cut down the power output-almost a geometrical progression. Therefore keep the engine free from carbon by having it cleaned out periodically and help along the good cause by getting proper carbureter adjustment in the first place.
 Another source of great power waste is the valve system. The valves must seat properly if full power is to be ob- tained from the fuel The only way to secure proper valve seating is to have tn eparts ground in at intervals of say two or three months, or when there appears to be need of the operation.
 At the present time we are not get