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Look at upsizing on the tires to lower the rpm at cruise.
This is tricky on trucks because at this point the past owner may have already upsized for looks.
Here is what to do:
get a scangauge (see link in my sig)
find a straight flat 10-15 mile stretch of freeway to aba test.
drive 50,55,60,65,70,75mph
record rpms and mpg
now yo should know the sweet spot in rpm for your best mpg.
upsizing your tires will lower the rpm at a given mph.
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