The cold air hurts mileage (but increases power)
The throttle body spacer doesn't help (waste of money)
Tranny cooler does help with lifetime and towing performance but I doubt it would help with mileage
The roof hauler would be detrimental to your mileage
Cruise control is detrimental to your mileage
Bedliner would be detrimental to your mileage but rust sucks more, I say go for the bedliner
There are a few things I can recommend, Pump your tires up to the sidewall max, take off anything on the roof including the cross members of the roof rack, install a grillblock, and get a scangauge II and learn how to drive efficiently. I say this in confidence because I have gotten 28mpg in a 2000 4x4 v6 s-10. You must be light on the pedal and draft semis at a safe distance whenever possible.
Then if you want to try hypermiling a blazer then you would then experiment with smoothing the undercarriage, lowering it, adding a splitter and then adding a boattail. On the newest mythbusters they did a hypermiling motorbike using 1"x1" framework covered with a semitransparent heat shrink similar to that used on boats in the winter. Good Luck
Don't add a fin it will look retarded and suck with crosswinds.
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