MORE MILES.

NZ Truth, Issue 1229, 20 June 1929, Page 6

MORE MILES.

THERE is much to be said on reducing running costs of a car — there is much more to be 7 done. The most noticeable running, cost is Motor Spirit, because of its regularity of occurrence, more noticeable, also, because it is often a ready money transaction. If Motor Spirit is a prime factor of running costs, how important is it to choose the most economical Motor Spirit and how necessary is its conservation ? ". Big Tree Motor Spirit is an economical Spirit that dislikes waste. . Here are a few practical hints to -reduce running costs. • 1

FREE AS AIR Most carburettors are adjusted to give too rich a mixture. Adjust your carburettor. Performance or. accelerating ability need not be sacrificed' by this adjustment, m. , fact operation of your car should toe improved. Mileage on a suitable Motor Spirit, distilled with mileage m view, may toe.increased on practically every car by adjusting the carburettor setting so that less Motor Spirit is fed to the engine. Excess Motor Spirit is not only wasteful, but it encourages carbon deposit m the cylinders; it is Jiable to attack the lubricating, oil m the crank case; tends to clog the whole of the system of the Motor Engine. What do these do to your car? Dilution of a ibadly chosen oil causes ineffective lubrication; carbon hi the cylinders prevents , the cooling system working efficiently; the engine may protest by "knocking," a sound that is recognised' by most motorists when it; occurs, and is insistent m its de--mands for attention. Have you heard the story of air and Motor Spirit? Even. if you ha\\e it is so important to my argument that it will bear repetition. Mixture is the mixing of air and vapour of .MotorSpirit; "too rich," implies too much Spirit vapour and an insufficiency of air; "Lean is the reverse,, too much, air and too little , vapour. A, gallon of Motor Spirit weighs .approximately seven and a-'quarter pounds. To burn this- Motor. Spirit, so.'that the vapour wilL result m economical movement' of your car, it takes about 100 pounds of air. This is a law of Nature that cannot be altered or played about with. To turn these figures into percentage — the mixture for a Motor Car is 92.75 per cent, air, air as free as# you breathe. ". 8 OWT. OF AIR If you had to buy air and store it m your car. you would need a load^-of well over 8 cwt. of air to tunna tankful ;of Motor Spirit into the vapour that wou,ld supply movement to your car. When yoy consider the large quantity of air and the si»all quantity of Spirit required by the Motor. Engine you. can see that it is all . important that the correct percentages are maintained, much more important than if the quantity of the two 'factors were: more evenly balanced. Every drop of Motor Spirit that is wasted, means something off the mile-

Age you will get- out of a gallon, of Motor Spirit. In Winter, Motorists have a tendency to enrich their mixture m the carburettor to enable an easier start. It this is done re-adjust-ment is invariably forgotten when summer, brings changed conditions. Keep your carburettor adjusted- according to the season or see that your service station does it for you. Choose Big Tree Motor Spirit,- for Big Tree claims Easy Starting and More Mileage. It is a fact that' it gives Easy Starting and gets More Mileage. STARTING Starting, a cold engine 1b very wasteful of Motor Spirit; use the choke as sparingly as .possible. The engine running with the choke on, uses four times the amount of Spirit that.normal running necessitates. Fifty startings of the average car uses up as much Motor Spirit as twenty miles of running. Every time you can make one stop act for two, you are obtaining more miles to the gallon. IDLING ■■;. Another cause of Motor Spirit wastage is unnecessary ; idling of the Engine. You may take it that four hours idling of , the engine consumes as ihuch Motor Spirit m the average car as ' 20 miles running. Idling often takes place on such a rich mixture that Spark Plugs foul,' cylinders collect carbon, and lubricating oils m the crank case' are contaminated. ;-.'-•.■ „ SPEED Speed always has to be paid for, paM for m excessive Motor Spirit consumption. This' is due to the fact .that air resistance puts a greater load on the power that a car uses when travelling at -great speeds. Twenty to twenty- five miles an hour is,, generally speaking, the most economical speed, for; a car.. An- increase of 5' miles • an hour , means additional consumption of 20 per cent. Big: Tree is economical when speed is required. Accelerating too rapidly exhausts Motor Spirit. A steady pick- up m rspeed'is often all that is needed. The driver of a car can contribute .his quota to the increase of mileage per gallon, although so much rests on the Motor Spirit itself. Big Tree was especially distilled and refined ,wlth .mileage m view, more miles to the gallon. Big Tree is a perfectly balanced spirit, but if there is one feature that outstands lhe other, it. is economy m running;, economy by giving you more miles to the gallon. That" 'is why the saying has arisen, "Big 1 Tree, the Spirit of the More Mile Age." ". -' ■■'--•■_-■ — — — ■ >— rrrT. -Ti