My truck is a bone stock 95 with 81,000 miles. Last two tanks of fuel it has gone from 21-20 mpg to 16 mpg. Have not lost power and recently changed the fuel filter. I realize addatives are put in winter fuel and as I have had the truck since new I have never experienced this before during the winter. I do have a small leak in the area of the fuel strainer/heater that I plan to fix today after reading about it in the forum. I would appreciate any help you can give (todays fuel prices being what they are) I have a service manual. Thanks, Tom/Idaho