MPG

The Best of Mercedes & AMG
If I go all highway, I can squeeze 400 miles out of a tank and I'm in the v6 c230. Also, I calculate my mpg's on how much I have to fill up the tank to how much I've driven because it's more accurate. Any idling before driving the car will screw up the average shown on the computer.
And why doesn't MB USA import more diesels? It doesn't really have to do with MB USA, it has to do with fuel giants pouring money into the politicians to keep some wierd regulations up so that they can make more money off higher consuming vehicles. Think about it for a second...if half the cars in the US were made diesels getting twice the mpg, that's roughly half the profits gas companies are losing.
Money talks, bull**** works, that's just how the world goes round.
I don't use any gasoline additives in my V6 3.2L C320. (Never even thought to do so.) My guess is the additives alone are screwing your MPG... The ECU has to learn and will accomodate whatever fuel you feed it, but only within reason. Go to straight gasoline for at least 3 tanks before you see the car settle into its new routine.
I buy gas at the local Tom Thumb grocery store. What "brand" they sell, I have no idea... don't care. I think it's 10% methanol.
I've been using midgrade (89) for 4 years now. No driveability problems whatsoever. It doesn't like 87 octane at all, but 89 offers no difference compared with recommended 91. As noted before the ECU makes the adjustment to 89 just fine.
I start the engine and wait for the adjustable steering wheel to drop to the driving position, then I put it in gear and go. (maybe 8-10 seconds) ie., no warmup at all. Time sitting still is gas wasted.
I do use Mobil 1, 0-40w oil exclusively. I change it once a year (about 8-10k miles). I've noticed a steady increase in mileage through 70,000 miles. I'm told that Mobil 1 actually delays engine break-in over a very long period of time.
I drive a mixture of city (5 miles) followed by highway driving (10 miles) to my destination regularly. Steady acelerations and decelerations. No jackrabbit starts. I usually have the a/c control set to "rest" (compressor disengaged). This is very important.
I achieve 365-390 miles per tank, always. 24.5mpg tank average, with an avg tank speed of 37-38mph.
On exclusively highway trips, I can regularaly crack 430 miles per tank, 31mpg, and the best I've ever seen is 33.4mpg. Max mileage seems almost entirely dependent on ambient temperature.
I'm perfectly happy with my gas mileage in my 10-yo W203. Just crossed over 80,000 miles on the odo.
Last edited by MB-BOB; Mar 9, 2011 at 05:42 PM.
That's strange you get so little. What have you done to your car?
When I drove Drew's C230 around one night, we managed a trip computer average of 18. That BLOWS. I rarely see below 23 in my C230K even in city grind.
And let's not compare the liberal emissions "bs" with the conservative "screw the planet, we're all gonna die anyway" mentality.
Also, when coming to a complete stop, my rpm's drop very low for an instant and lights dim out slightly during this, but always recovers back to normal.
Wind resistance is a large factor.
Last edited by Carsy; Mar 7, 2011 at 01:30 AM. Reason: sp
As far as your lights dimming and rpms going down, never heard of such a thing. Should prob get that checked out pretty soon or it sounds like your car might stall on you one day.

My MPG is so low.. if i took a picture of what ive been getting for the last 2k miles you all would laugh.



