My highway best (read: Arizona to Indiana) was about 36MPG in the Elantra.
I did make half a tank though on 260 miles, and being that a usual half tank fill-up took about 6 gallons in the Elantra, that's right around 43MPG. The actual fill-up was only 5.2 gallons, but the needle was barely at full, so I assume it cut the filling early.
So far with the Tiburon, I have about 240 miles on 3/4 of a tank of gas. Pretty much right where the Elantra was getting me. However, that's on factory setup. As of tonight, I converted the factory intake to cold air, so maybe see some improvements soon.
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