A boost gauge is helpful in a turbo diesel vehicle when trying to find economy. Keep your boost as low as possible for the speed you travel and it will reward you with better economy. You may even notice a mph point where boost ramps up dramatically, if this is the case you can slow your cruise speed to where it drops back down and find economy there. You will most likely find a majic speed where this happens so you can adjust your cruise speed accordingly. It takes fuel to spool a turbo and make boost, keep the boost low for economy.
Travis..
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