Some stats from the GoDuke website (credited):
Duke: "In just one season under Johns, the Blue Devils went from last in the ACC in 2021 to fifth, fifth, and seventh in scoring offense, total touchdowns and passing touchdowns, respectively. In addition, Duke improved in pass efficiency (11th in 2021 to fifth in 2022) and total offense (seventh in 2021 to fourth in 2022)..."
Memphis: "During each of his three seasons, Memphis was among the top five in the American Athletic Conference in scoring offense, including averaging 30.1 points this past season...
...In his first season, Memphis ranked among the top 20 nationally in nine statistical categories: passing yards (7th), scoring offense (8th), passing yards/completion (9th), total offense (10th), first downs (10th), passing efficiency (10th), passing offense (17th), passing touchdowns (17th) and third down percentage (19th). The Tigers accumulated more than 500 yards of total offense seven times on the year, including 542 yards versus Big Ten foe Penn State in the Goodyear Cotton Bowl Classic..."
Texas Tech: "He guided a Red Raiders offense that ranked fourth in the country with 352.6 passing yards per game and 12th with 485.2 total yards per game. Texas Tech also averaged 37.3 points per game that season, which was the fourth-best mark in the Big 12..."
Indiana: "The Hoosiers rewrote 54 school records during Johns’ time there, including season marks for points, total yards, passing yards and rushing yards."