I dont know if this translates to Diesel but Ill add it. I installed a ram air intake on my 2003 toyota techoma the first drive I gained 4mpg from 21 to 25 at 65mph the next time the confuser had detected the lean condition and adjusted the fuel ratio.NOTE now when I drive at 35 mph the ram air will hold the speed at 35 with no throttle, nice for in town.
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