Trying to snap a two-game skid, the Rams flew to Raymond James Stadium for an intraconference duel with the Tampa Bay Buccaneers.  After a scoreless first quarter, Tampa Bay managed to strike first prior to halftime with kicker Matt Bryant getting a 27-yard field goal.  After a scoreless third quarter, St. Louis got its only score of the game with kicker Jeff Wilkins getting a 25-yard field goal to begin the fourth quarter.  Afterwards, the Buccaneers ended the game with RB Earnest Graham getting an 8-yard and a 28-yard TD run.
Question: How many yards longer was Earnest Graham's longest touchdown compared to his shortest?
Answer: 20