I run an IMPUL full body kit and it is 2" lower with the standard factory suspension.
I would say that was worth 10%+ in my mpg.
Before I found this site, I was getting 25+mpg (epa 22hwy) with just the body kit, no mods and conservative driving.
Recently I lowered the front end 1.25". (also taller tire) I hit my best long distance trip mpg of 32+
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