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hey good choice in trucks i have a 93 Yukon.currently i am just using a vacuum gauge to help "teach" me to drive more FE.I plan on deleting the roof rack.
my thoughts on free flow exhaust is more helpful at higher rpm which you should not be doing for FE.plus the louder it is the more your going to rev it up and get on it to hear the cool noice.
make sure it is tuned up and running its best then adjust your driving.i learned alot from the hypermiling tips on here.
btw what milage are you getting?
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