OFF ARPT LNDG DUE FUEL EXHAUSTION.

Narrative

I WAS ON A XCOUNTRY FROM 9K4 TO BFF; NE. WHEN I LEFT FOR THE TRIP BOTH TANKS WERE TOPPED OFF GIVING ME 22.5 GALLONS OF USABLE FUEL. THIS ALSO GIVES ME 4 HRS OF FLT TIME. I WAS IN THE AIR FOR 3:15 AND WAS ON FINAL APCH WITH MY L FUEL TANK GAUGE SHOWING 1/4 TANK OF FUEL LEFT. SHOWING 1/4 OF A TANK OF FUEL LEFT AND ONLY BEING IN THE AIR FOR THIS AMOUNT OF TIME; IT WOULD HAVE LET ME LAND WITH NO PROB; AND STILL HAVE MY ADEQUATE AMOUNT OF VFR FUEL RESERVE. WITH ME USING THE PROPER PLTS OPERATING HANDBOOK; USING LORAN; GPS; AND GETTING ALL OF MY XCOUNTRY INFO OFF OF THE DTC DUAT WX AND XCOUNTRY PLANNER; ALL OF THESE SHOWED ME THAT THERE WAS ADEQUATE FUEL AND TIME TO REACH MY FUEL STOP. THE ONLY THING THAT I MIGHT BE ABLE TO SAY TO HELP PREVENT THESE OCCURRENCES IS TO HAVE THE FUEL TANK GAUGES CHKED FOR ACCURACY OR MAKE SOME WAY POSSIBLE TO DETERMINE THE SPECIFIC FUEL CONSUMPTION FOR THAT SPECIFIC ACFT SO JUST A GENERAL FUEL CONSUMPTION DOESN'T HAVE TO BE USED; BECAUSE EVERY ACFT IS DIFFERENT; AND ONE GENERAL FUEL CONSUMPTION ISN'T ADEQUATE FOR EVERY ACFT IN THE UNITED STATES.