I am experiencing Dismal fuel Economy, I filled the tank about 16 gallons (tank read full) and went 118 miles, I burned to about 1/4th of a tank remaining, so a rough estimate is I burned 12 gallons of fuel to go 118 miles, leaving me 5-8MPG Cruising 50-60 miles an hour.... What should I be looking for..... I have 110,7XX on the truck. it's slow as heck, it hesitates and just has no get up and go unless you really step on it. It's had a recent tune up. Plugs were changed at 105,000 miles roughly.... I'm at a loss to know why this little truck is burning so much fuel. It's the 6 Cyl Flex fuel engine. with just normal fuel run in it... any ideas? I've looked at night for arcing wires and there's no flashes... there is no real miss, I checked the intake for pirate air and fixed one minor leak and have recently rechecked it as well...I've not pulled the plugs out again yet.... any suggestions?

Let me know if my MPG estimations are off some. math is not my strong suit but it's a rough estimation...

* This was half freeway half backroads

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed