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18 mpg for the van is already pretty good. She's working well. I can only get 20 or so with my pickup and bed cover.
The biggest 7.3 failure that causes a drop is mpg is exhaust leaks around the stupid uppipe exhaust connection between the exhaust manifolds and the turbo. Leaks here cause a loss of drive pressure for the turbo and dropped efficiency. Easy to change on a van.
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2000 F350 7.3 powerstroke diesel
2009 klx250s dual sport motorcycle
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