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WUNDERIN, WAS DRIVING ACROSS CANADA, AND MIDDLE OF TRIP CHECK ENGINE LIGHT CAME ON, NOT WANTING TO WORRY THE PASSENGERS I JUST WATCHED THE REST OF THE GAUGES VERY CLOSELY. MY HP SEEMED THE SAME AS WELL AS THE GERNERAL OPERATION OF THE TRUCK, BUT MY 14MPG TRUCK ALL OF A SUDDEN WAS GETTING 21MPG!!!! :-staun AFTER 3 FULL TANKS OF GAS, INCLUDING STOPPING FOR FUEL/FOOD AND SHUTTING IT OFF NUMEROUS TIMES MY MILEAGE WAS STILL AT 21. THEN AS SUDDEN AS IT CAME IT WENT, I FILLED BOTH TANKS AND WENT ON MY WAY, MILEAGE WAS 14. WHAT WIRE DO I CUT TO GET 21???
Get the trouble codes from your computer and start from there. They are the reason the light illuminated so they should be a clue to the cause. List them here and we can take a poke at it.