excessive gas useage
 

93 B2600i 5spd 2wd. Has anyone had a problem with the engine using up more gas than it should while driving on the freeway? I'm on a trip right now and ran out of gas once at only 213 miles running a/c most of that time. I've never had a vehicle use up so much nor get so little miles. Gas gauge works for the most part but won't show anything below 1/4 tank.