Now I know what DTE stands for

Amy's van has a little display with miles per gallon, temperature, etc. It also had this thing called DTE, now I knew what it meant, it was the number of miles you had before you ran out of gas. I figured that the E stood for empty, but I couldn't figure out DT. Well, now I know, DTE stands for Distance to Empty. Should I start to doubt my intelligence? I think I should have been able to figure that out.