Thread: Fuel economy on full sized US diesel trucks
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Old 02-28-2013, 02:04 PM
SD Blue SD Blue is offline
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Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,186
With an old Ford 6.9L, I noticed the biggest difference when towing. It would get about 16 unloaded but would drop to 12-13 when towing a small 5th wheel and boat. The previous gasser, Ford 351, would get about 6 mpg, if that, with trailers behind it.

I usually ran 65-70 mph and never more than that. If you have ever had a tire go at 70+, while pulling a trailer with a single tire axle, it will take all you can muster to keep things in a straight line.
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Sam

84 300SD 350K+ miles ( Blue Belle )
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