I have a serious problem with my 95 ranger 4.0 v6.. Im getting about 4mpg city and 9mpg highway.. I just bought the truck. I know it needs an alignment but its getting the worst gas mileage ive ever seen in any truck ive ever owned. the plugs look good.. no dummy lights on the dash.. no black in the tail tipe.. new cat front and back with new sensors...

any ideas?