YES YOUR MILEAGE IS LOW! I own a 1993, 34 foot Allegro Bay, my mileage runs between 7.2 & 8.2 towing a 2000 Saturn and running about 65 miles per hour. Things like how fast you drive, how much weight are you carrying, are you towing & what are you towing, what type of terrain are you driving, all factor into your mileage. You did not mention the year of your rig? Do you have a carburetor or TBI throttle body injection? If you have a carb, when was the last time you had it rebuilt? Changing over to TBI, if your not mechanically inclined might hurt your budget. My old 1984, 27 foot Allegro had a carb. and I averaged over 8 mpg.