I-75 South with a by-pass of the hills in Tenesee

We've driven I-75 up to the Canadian border and I don't recall any steep grades. It is hilly around Chattanooga but it never crosses any mountains. I have to admit to being insensitive to grades however. We went up Moki Dugway twice this last summer, didn't bother me at all tho the wife was white knuckled. But except for the hills around Chattanooga I-75 is mostly flatish. There are some hills in Georgia but they don't amount to much.