Gasoline and Diesel Advanced Technology Vehicles | US EPA

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Gasoline and Diesel Advanced Technology Vehicles. gas and diesel car. Most people think of electric, hybrid and hydrogen fuel cell vehicles ... Skiptomaincontent Officialwebsitesuse.gov A.govwebsitebelongstoanofficialgovernmentorganizationintheUnitedStates. Secure.govwebsitesuseHTTPS Alock(LockAlockedpadlock)orhttps://meansyou’vesafelyconnectedtothe.govwebsite.Sharesensitiveinformationonlyonofficial,securewebsites. GreenVehicleGuide ContactUs GasolineandDieselAdvancedTechnologyVehicles Mostpeoplethinkofelectric,hybridandhydrogenfuelcellvehicleswhentalkingaboutadvancedautomotivetechnology,butdidyouknowownersofconventional(gasolineanddiesel)vehiclesarealsobenefitingfromcutting-edgetechnology?Sinceconventionalvehiclesstillmakeupthemajorityofnewvehiclespurchased,andwillcontinuetodosointheyearstocome,itmaybegoodforyou,yourwallet,andtheenvironmenttolearnaboutsomeoftheseneweroptionsnowavailableonthedealershiplot. Gasolineversus Diesel Gasolineanddieselarebothfuelsrefinedfromcrudeoil,butwithsignificantchemicaldifferences. Beforebeingrefined,crudeoilcontainsavarietyofhydrocarboncompounds. Refineriesseparatethesecompoundsintoavarietyofproducts,includinggasolineanddiesel.Incomparisontogasoline,diesel: Isdenserandhardertoignite Containsmoreenergypergallonoffuelthangasoline(generallyresultinginhigherfueleconomy) Containsmorecarbonpergallon(generallyresultinginmoreCO2emissionspergallon) Gasolineanddieselrequiredifferentenginetechnology,socarsandtruckswilluseonefuel or theother,neverboth. AdvancedTransmissions:Theadvancedelectronicsintoday'svehiclescanoptimizegearshiftingforimprovedfuelefficiency.Six-,7-,and8-speedautomatictransmissionsarenowavailable,withevenmoregearsbeingaddedtonewermodels.Continuouslyvariabletransmissions(CVTs)canchangeseamlesslythroughaninfinitenumberofgears.Transmissionswithmoregearsallowtheenginetorunatitsmostefficientspeedmoreoften,improvingfueleconomy. CylinderDeactivation:Cylinderdeactivation"turnsoff"someoftheengine'scylinderswhentheyarenotneeded.Thistemporarilyandseamlesslyturnsan8-or6-cylinderengineintoamoreefficient4-or3-cylinderengine. ImprovedAerodynamics:Reducingavehicle'saerodynamicdrag(windresistance)improvesfueleconomy,especiallyathigherspeeds.Manymanufacturersareimprovingaerodynamicsbyrefiningvehicleshapesorbyusingexternalmovingpartssuchas"shutters"thatcloseoffthegrill,allowingairtoflowsmoothlyaroundthevehicleinsteadofintotheenginecompartmentwhereitproducesmoredrag. LighterVehicles:Reducingvehicleweightimprovesfueleconomy.Manufacturersarebeginningtoredesignvehiclestoweighlesswhilemaintainingperformanceandsafety.Onewaytodothisisbyreplacingasteelbodywithalighter-weightmaterial,suchasaluminum,whichcanreducevehicleweightbyhundredsofpounds. LowRollingResistanceTires:Astiresroll,theyflex,whichusesenergy.Tirematerials,construction,andtreaddesigninfluencetheamountofenergyused.Designerscanselectthesecharacteristicstominimizerollingresistance,whichcanimproveavehicle’sfuelefficiency. Start-StopSystems:Start-stopsystems(sometimescalledidle-stop,smartstart,orothermanufacturer-specificnames)savefuelbyturningofftheenginewhenthevehiclecomestoastopandautomaticallystartingitbackupwhenyoustepontheaccelerator.Start-stopcanimprovefueleconomyby4%–5%andprovidesthebiggestbenefitinconditionswheretheenginewouldotherwisebeidling,suchasstop-and-gocitydriving. Turbocharging:Turbochargingsavesfuelbyallowingasmaller,morefuel-efficientenginetobeusedinplaceofalargeronewithoutgivinguppower.Bycompressingtheairgoingintotheengine,turbochargersallowsmallerenginestoperformlikebigengineswhentheyneedto,whilemaintainingthefuelsavingsofasmallerengine.Replacingan8-cylinderenginewithaturbocharged6-cylinderora6-cylinderenginewithaturbocharged4-cylindercansavefuelandstillprovideextrapowerwhenneeded. ContactUstoaskaquestion,providefeedback,orreportaproblem.



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