Back on topic, I am currently on my first tank using the scangauge on the Elantra. Looking at my fuel log, a mixed 50/50 tank should lead roughly 30 mpg. Guess what, I'm going to hit 37+ mpg on my current 50/50 tank. The SG may be off as it's not calibrated yet, but I know the distance points at the quarter tank and half tank marks for 35 mpg and I'm past that.
The SG is the single best mod one can do.
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