Fuel tank capacity (bluetec) mystery
which is 21.4 US gal or 18 Imperial gal. or 0.335 hogsheads (US) or 0.2444 hogshead (Imp)... you get the picture
Trending Topics
The Best of Mercedes & AMG

I don't know if any of the rest of you have that kind of pricing, but one of the newer ways the oil companies have to
Sorry for the confusion I might have caused. I pulled up a British User Manual on line and sure enough it said 18 gallons on the Specifications sheet. But this is due to difference between the US and British gallons. It now makes perfect sense
!Now, I think that my Low Fuel indicator (the yellow one) goes off way too early. I once filled up the tank right after the yellow light came on and it only took 18 US gallons to fill it up. So, this makes the reserve of 3+ US gallons. That would give me close to 75 miles of driving in the city (I have Bluetec).
My low fuel light also comes on when I have approx. 3 gallons left I would estimate because the estimated range shows around 30 miles left usually, and I keep driving, and then the second warning comes up on the center display (the one where it no longer shows you the range, but a picture of the car with a fuel pump next to it) and that is usually when I fill up and it takes right around 19 gallons.
I don't know if any of the rest of you have that kind of pricing, but one of the newer ways the oil companies have to
When you think about it, since fuel is almost invariably stored in ground, 59 degrees is not far off what you would expect on ~almost~ any normal day. There has to be a standard, and 59 degrees is a pretty good one.
Long range pilots of the long past used to fill their tanks in cold storage buildings at airports. They'd then hurry like hell to taxi and take off before the warming fuel blew the tops off the tanks!

What I would like to see is for all of us to post actual tank averages and not what the computer says!
I always do better by the computer, but when I fill mine and do the math the old fashioned way, mpgs are always less.


Derrel

Your extremely high fuel economy leads me to think that maybe you
forgot some of the gas you added during your long 3,000 mile trip.

Do you know how much higher than the EPA estimates that is?
The EPA lists yours at but 23 mpg on the highway.
When I figure tank mileages, the figures are always less than what the computer will say!
Start a Fuelly and record each and every tank and let us see how you do please.
Yours is the older 5.5 L motor. The 2012s have smaller engines at 4.7L and
are listed as doing better than yours, even though they are 4-matic.

Derrel
Last edited by Green E-300 DT; Jul 15, 2012 at 11:10 AM.
Do you know how much higher than the EPA estimates that is?
The EPA lists yours at but 23 mpg on the highway.
Start a Fuelly and record each and every tank and let us see how you do please.
Yours is the older 5.5 L motor. The 2012s have smaller engines at 4.7L and
are listed as doing better than yours, even though they are 4-matic.
Each and every tank and mileage was recorded.
I'm not about to send you the spread sheet. And I'm not about to do your "fuelly" and send you results. My trip was a "fuelly," as you call it, and you have the results.
I did the identical trip, even to hotels occupied, a year earlier. The average for that 3,000 mile trip was 27.1 (vs. 28.9 this year). I attribute the difference to high winds on the earlier trip and possibly to a car barely broken in.
FYI, the EPA numbers are "estimates" and based on dynamometer tests, at EPA specified speeds, and assumed calculations to simulate real-world conditions. You will see many comments here on road trips far exceeding EPA highway mileage ratings.
And yes, I used the fillup-to-fillup method to calculate and didn't forget to log any fuel bought.

Yours I do believe! Not the 38 mpg for true tank averages however. Computer yes, but tank mileage, no. I have seen mine report as high as
45 mpg running on a long trip from Sacramento to LA, but it did not do nearly that amount when figured out fuel used for those miles traveled.
Why is the 33 mpg correct? Because it is 'right on' with what many others on Fuelly record.
When someone tries to say that they drove 3K miles with a big V8 gasser (5.5L) and got tank mileages
of 28 plus mpg, well that is simply too much and not believeable and I do not except that!

If that were true, no one would be buying diesels.
Ask why MBZ dropped down with the E-550 (5.5L) to a smaller 4.7L for the currect model.

They were after better fuel economy, and IF the older 5.5L was doing as well as some here claim, why would they have gone smaller?

Post your true fuel economy on Fuelly. That is how to report true fuel economy!

Derrel
Last edited by Green E-300 DT; Jul 16, 2012 at 11:20 AM.
Feel free to believe that I'm either lying or that I flunked 3rd Grade arithmetic if you wish.
Feel free to believe that I'm either lying or that I flunked 3rd Grade arithmetic if you wish.









