22 



BULLETIX 174. IT. S. DEPABTMEXT OF AGBICULTUBE. 



While the figures in Table XI would appear to indicate that the 

 consumption of fuel per drawbar horsepower is considerably greater 

 for the small tractors than for the large ones, Table XIV shows that 

 the small tractors are usually loaded more nearly to their full capacity 

 than the large ones, and the consumption of fuel per unit of work done 

 is slightly less for the 12 and 15 horsepower tractors than for those 

 of 30 horsepower. 



Table XI. — Average consumption of fuel per hour by different sizes of engines and per 

 drawbar horsepower hour on farms in North Dakota. 



Drawbar rating of engine (horsepower). 



Fuel consumption per hour. 



12 



15 



20 



22 



25 



30 



3.264 



3.462 



3.211 



5.419 



4.725 



5.761 



.272 



.231 



.161 



.246 



.189 



.192 



3.851 



4.177 



3.140 



5.885 



5.858 



5.675 



.321 



.278 



.157 



.26S 



.234 



.189 



First year: 



Per engine gallons. . 



Per drawbar horsepower do 



Second year: 



Per engine do. . . 



Per drawbar horsepower.. 



do.... 



5.684 

 .142 



6.367 

 .159 



There appears to be considerable irregularity in the figures shown, 

 but this is not really the case, as the reasons for the varying con- 

 sumption for the different sizes are as follows: The 15, 22, and 30 

 horsepower groups all contain a larger percentage of kerosene tractors 

 than the 12, 20, 25, and 40 horsepower groups, and, as has already 

 been shown, the kerosene tractors consume a greater quantity of fuel 

 than the gasoline tractors. There are also more kerosene tractors 

 in the 12-horsepower group than in the 20, and several of the outfits 

 included in the 20 and 25 horsepower groups are apparently over- 

 rated, to judge both by their fuel consumption and by the amount 

 of work done, as shown in other tables. 



The fuel cost per unit of work varies, of course, with the price per 

 gallon. The prices for the different fuels vary considerably in dif- 

 ferent States. The averages of those reported are shown in Table 

 XII. The general averages per gallon for the four fuels commonly 

 used were as follows: Distillate, 8.17 cents; kerosene, 10.08 cents; 

 motor spirits, 15.86 cents; gasoline, 18.94 cents. The distillate and 

 motor spirits are not extensively used, as the table shows. 



Table XII. — Average prices for fuels, per gallon, as reported by farm tractor ov:ners. 



State. 



Gasoline. 



Kerosene. 



Motor 

 spirits. 



Distillate. 





Cents. 

 22. 99 

 19.51 

 18.47 

 18.06 

 17.72 

 17.50 

 17.50 

 17.00 

 16.23 



Cents. 

 15. 37 

 11.79 

 9.86 

 9.44 

 9.31 



Cents. 



Cents. 





16.53 

 14.39 























8.29 



Texas 



9.90 

 7.90 

 7.78 







6.25 























18.94 



10.08 



15.86 



8.17 







