264OPERATION
Tires
Heavydutythreadedtiresincreaserollingresistanceconsiderably.Forlonghaul,
chooseasmoother,ribbedtypetire.Choosealuggedtypetireonlywhentheadded
tractioninmudandsnowisneeded.
Thenumberofwheels(axles)hasadirecteffectontherollingresistanceand,thereby,
thefuelconsumption.Forvolumeand/orlowweighttransports,theuseofa4x2
insteadofa6x4shouldbeconsidered.
Ifthetirepressureistoolow,therollingresistanceincreasesand,thereby,increases
thefuelconsumption.Theoveralleconomyisalsoaffectedastirewearincreases
considerably.
GrossV ehicleWeight
Thegrossvehicleweightofavehiclecombinationhasalargeimpactontherolling
resistance.
Accessories
Asarule,accessoriessuchasroofrack,advertisingsigns,bugscreens,exposedair
horns,etc.,haveanegativeeffectonfuelconsumption.
ServiceandMaintenance
Amodernheavy-dutyvehiclerequiresregularandpreventivemaintenancetoensure
thatallitscomponentsfunctionastheyshould.Usetherecommendedpreventive
maintenance(PM)programthatV olvoTrucksNorthAmericahasdevelopedfor
thevehicles.Thisensuresoptimalenergyefciencyfromallcomponentsthatare
importanttofuelconsumption.
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