Arizona republican., 1920-01-18

performance with the least carboniza ton.
 In most localities there are a num- Der of gasoline stations and the oNnci usually ~oes to the same one each time, but when the owner ventures away from the trodden path he buy $ whatever 5asiis.e the wssysiGe dealer has to sci. IL is quite rossioie that in all these different dealings he may procure gasoline Of gaca and uniform quality, but 1t is mitch safer. after haN- ing found good grade Of fuel, to buy that grade only. l refer to s grade as a srademarned fuel or ore put out by a certain rafiner. The need for this precaut.on ill buying is much greater now than n years gone by, when the fuel w.s a0G $ so-caileG mix Today all gaSollnes' you buy are physical mix lures or different fuels. Some of the mixtures arc wei made and are made with exactly the same proportions ot each constituent Others. however, are made with whatever ingredients the refiner happens to have ia quantity, with the result that the gasoline from the latter refine-s will not be of constant composition and will give trouble.
 In the past we have referred to gasoline as having this or that specific gravity, or perhaps Raume gravity. Those terms do not indicate the quail ity of the gasoline at all. The real in- dicators of the quality are the initial and final boiling points, but these fig- ures are not generally known by the gasoline dealer and might lead to a lot of deception anyway. The owner has only to try one grade of gasoline for a week and if the engine performs satis- factorily he should not change to ar- other fuel unless the thinks he can Inn prove engine performance or economy or both.
 Now for some advice on getting what you pay for when you drive up to the gasoline station. Especially on these cold days the car owner is apt to say "Fill her up, leaving the whole work of filling the rear -ank to the gasoline dealer. The average dealer is honest, but always be sure that his pumping outfit pumps what the indicator says At all filling stations the gasoline IS drawn from underground tank by means of a hand operated pump As many things can go wrong with that pump as can go wrong with tlrc pump. and you know from experience that the tire pump doesn't always pump air in the desired volume. Lealxy things contribute to short measure of air, and likewise in the gasoline sta- ton to short measure of gasoline.
 If you ever have listened to the gaso- line as it is being forced out through the nozzle, you may have noticed that often there is a spluttering sound, and if you will look at the end of the nozzle on the next occasion you will find that that sputtering brings about condition where the volume pumped :s seduced. The sputtering is caused by air being forced out with the gasoline. When you hear sputtering rest assured it will be worth while to ask to have the measure checked, unless you are satisfied to pay for air with your gas.
 It should really be the duty of the gasoline vender to have his measure checked. unless you are satisfied to play sign stating so, and also giving the name of the official who checked it. If no official certificate is present. ed upon demand it should not be be- heath the dealer to demonstrate the accuracy of the measure by making test before the consumers eyes.
 Most owners are familiar with the fact that thn hose can hold as much as half a gallon and that after pump ing the house ought to be drained in order that full measure be obtained