Quote:
Originally Posted by bustedbenz
1. The only way to measure fuel mileage with any accuracy is to pretend the gauge does not exist. Go to a diesel pump on level ground and fill it right up to the brim. Let the foam go down, keep filling until there is literally liquid fuel right at the rim of the tank filler. Where you can see it, and know where that spot is.
Run the car until you get nervous, preferably down close to empty. Refuel at that same pump on that same level ground clean up to the neck again. Then divide the number of miles driven on that tank (write down odometer readings) by the number of gallons you put in the tank.
Repeat at least 3-5x. Then average your mileage. The gauge is inherently useless. I routinely drive 125 miles past when my gauge bottoms out on R.
2. Oil color is a useless measurement on a diesel. There is no "oil getting bad" feature on this car. Only a low oil level indicator light, which is no indication at all of oil change interval. The interval on this car is 5 thousand miles, not 3. Change it at a known time, write it down, repeat every 5k if you use "standard" oil, perhaps 7500 if you use synthetic.
EDIT: I realize now that the odometer isn't working. You'll need it working before any fuel measurement is successful.
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You are definitely right I was mistaken and I feel stupid for saying what I did about the oil light. I was thinking it was like some of the really new cars that actually tell you when it needs to be changed. This car only tells when it's low so that is useless to me. Thank you for pointing that out. Still yet the oil is pretty black so obviously it's broken down and it needs to be changed. All I'm saying is with a 26 or so gallon tank and 25 mpg I should be able to drive 45-50 miles and no matter WHERE the needle is on the gauge it shouldn't hardly move. That's a BIG tank. My 91 Mitsubishi Mirage has a 13 gallon fuel tank and I can drive that distance and the gauge hardly even moves and that's half the size of the tank on this car. You can't honestly tell me that driving 45-50 miles on an 1/8 of a tank there isn't something wrong. I've driven so many different types of vehicles and I have always been pretty damn good at guessing the mileage with such measures I am using. Not to mention every vehicle I have ever owned the needle has gone slower on the top half of the tank then it has on the bottom half. My needle was almost on the 3/4 mark when I started the drive and ended 1/8 of a tank lower then that when I was finished. Then I drove another 40 miles and it was on half a tank. So 1/4 of the top half of the tank and only gone 80-90 miles at the most? So that means if I drive another 100 miles my car will obviously be on empty. Is that really that hard to figure out?
I'm not trying to argue with anyone either I'm just saying just because you believe there is no way anything can be told by doing it this way doesn't mean that it can't be done.
All I'm saying is the mileage is extremely bad. If I can watch the needle move while I'm driving something isn't right.