I was looking for something else related and found this. It says it fits the round vents in newer mustangs. I thought "well my Class C has round vents and is from Ford. Perhaps 2 universes under one God could collide. (not calling Ford God; there far from it. Toyota maybe...
)
I dont see any mention of MPG but it does have analog inputs, something the scangauge does not so you could get a boost/vacuum gauge or something.
https://www.americanmuscle.com/raxio...auge-1516.html