I have a 2002 GLx santa fe V6.. It says it's a 4 speed auto.. the manual says some were 5 spd Auto. I just notice the Rpm seems high like it needs to shift into 5th or OD... Gas mileage is poor.. I know small tank makes you think it is worse than it really is...2000 Rpm is 60 miles per hr.. My Bro in-law said his had a button for OD. I am sure mine don't . Please help ??