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a cam can change the rpm range where your engine operates most effectively, some milage cams with low lift and shorter duration were effective at increasing some older v-8,s milage master, was one of them, you would have to research the avalible cams for your engine and see if it will pay you back,, you should also look at partial grill blocks,underpans,mirror delete/reduction,and other aerodynamic changes and consider a 149.00 scangauge that will tell you avarge mpg/instant mpg,rpm,tps position,air inlet temp,water temp and much more info that you can use to drive more efficently it also scans and clears trouble codes( its for obd2 cars/trucks).
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