Originally posted by RedNut:
If you read my other posts I have been asking about fuel mileage issues on my 98 12valve(avg 9-11 empty with 3. 54 gears and auto)
I went back and read your posts, and notice you said "city" driving. We all try to be precise, but the terms we all use mean different things to different people. To some, "Highway" is 80 mph on wide open road, to others it is cruising at 60 to 65 mph. My "city" driving has long stretches of 45 mph and less than 10 stoplights encountered all day - my mileage goes UP compared to Freeway driving at 75 mph! But if I was hitting 30 stoplights and running the AC, I bet my mileage would drop under 14 also. So, here's the good news: To see if you really have a problem, you're going to have to take a weekend vacation!
You need to find someplace 400 miles away that you've been meaning to visit, and get out on the open highway. Keep your speed under 65, unless you need to go faster long enough to pass someone or to prevent creating a traffic disaster. Pick gas stations with pumps on level ground, and fill the fuel all the way up the neck, before, during, and after the trip. Take your time - keep going until you see fuel, not just foam. During the trip, check your odometer against the mile markers over a 10 mile stretch of freeway. Do this odometer check two or three times, and take the average. If there is any inaccuracy then multiply your mpg by the same correction factor. If you do all this and you are still getting under 18 to 20 mpg (4WD) or 20 to 22 (my guess for 2WD), THEN you will know you really have a problem. I know this is a lot of trouble and will cost you $$ for fuel and maybe even Motel rooms, but if you do this one of two things is going to happen:
1) You'll KNOW it is the city driving killing your mileage compared to others, but at least you'll be happy with your truck, or
2) You'll know, and I mean really KNOW, there is a problem with your truck.
P. S. - If it turns out to be #2, then I agree with those that said find another dealer or pay Cummins. Once your truck is fixed, if you are still mad, then demand DC reimburse you for the $$$ you spent and write nasty letters about the incompetence and poor Customer Service attitude of the dealer who couldn't/wouldn't fix it. But don't go on being unhappy with the truck!
GOOD LUCK!
P. P. S. - If you are married, don't tell the wife WHY you are taking the trip - tell her you've just been dreaming of a little get-away.
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[This message has been edited by HC (edited 10-15-2000). ]