For maintenance cost, the survey records indicated that regardless 

 of age or mileage some maintenance was performed. This amounted to 

 about one percent of new truck cost per year. 



Repair and maintenance costs per mile are expressed by the follow- 

 ing: 



C + (Y-X) .OIN 



RM 







Where: 



C = total repair cost 



Y = number of years to major overhaul at A miles per year for specific 



truck 

 X = number of years to major overhaul at 10,000 miles per year 

 N = original price of chasis plus one-half original price of platform 

 O = miles to major overhaul for size of truck 



For different annual mileage levels Figure E-2 was constructed. Cost 

 per day increases on a straight line although not proportionately as 

 miles per day increases. 



Table E-2. Value of Constants for Repairs and Maintenance Cost 

 Equation for 190 and 220 Crate Trucks. 



Truck Size 



N 



O 



Figure E-2, Truck Repair and Maintenance Cost Per Day 

 Relative to Daily Mileage. 



100 150 200 250 



Level of truck use —miles per day 



57 



