I avereged 23 mpg with it on a 4000 mile roadtrip, some ecodriving, and some NY state 80mph... but with a trip where I went 55-60mph (90kph) the whole time thereabouts, managed to pull 25. Things I had done to it:
was a 4.3L V6, 700R4 auto 4 speed.
aero cap (2x4/coroplast)
LED tail lights
LED dome light (used alot for work)
headlight/grill block covers
215/75R15 LRRish tires (kingstars found at wallyworld)
Radiator fan removal (100%, no electric)
Front under tray of coroplast from 1/2" in front of airdam to front frame cross-member
Super extra occasional use coroplast front airdam wraparound
That was about it.
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