stingray71

I've only had my '06 E350 for a little over a month now but it seems to get very good gas mileage. On the highway, I averaged about 33-34 mpg on a long trip. Going to work, my combined mileage is about 26-27 mpg. It looks like the EPA estimates were 25mpg HWY and combined mileage was about 20mpg.
I haven't verified my trip computer's accuracy by mileage and gallons when filling up yet. Have people verified that the trip computer is reflecting the actual mpg? Or is it just painting a rosy picture? I'm hoping it is true.

amdeutsch

Rosy pic. Mine is reading approx 4% higher

flossinlo05

I've had my '07 E350 sport for about a month now. Went on my first road trip from Houston to Dallas, about 240-250 miles. I reset my trip and filled up my tank right before I got on the road.

Averaged 73 mph door-to-door (drove about 80-83 on the highway), 26.6 mpg with a total range about 550-600 miles depending on when I checked. I thought that was really good.

chokaay

That is really good! Currently one of my 2009 E350's is averaging 16-17mpg, and the other one is averaging around 19-21mpg. However, I've heard that after a few thousand miles, the mpg in these vehicles will improve significantly.

Jen_Kenne

(E500) I have checked the computer and found it within a percent or two of what I calculate. On the highway, using the cruise control, will take me above 27 mpg. I use "Automotive Wolf" to track all of my expenses, since some are deductible and my wife is a CPA. On typical trips on I-95, with occasional bursts beyond 120, my last tank averaged 23.84, which I consider excellent.

chokaay

That is indeed excellent! When breaking my vehicle in for the first 1000 miles, I got around 21.8-23mpg. While training my adaptive transmission for the past 400 miles, my average mpg for the total 1400 miles dropped to 13.8mpg. Now with "normal driving" I'm averaging around 16.9mpg-19.8mpg (after reset at 1402 miles). Hopefully it'll get better than this...

stingray71

I'll find out about mine in a few weeks when I have to refill the gas tank. If it does average 26mpg, then it will sting a little less each time I have to pay for the premium gas.

erifly

Unless its a diesel I highly doubt it is accurate. Those are really high numbers even if you drive the whole tank on the highway. I had an 03' E320 and got 25-27 on highway(traveling 350+ miles), I think the 06 was a 7 speed so those do get better gas mileage but not like that. But I don't know what could cause it to be off, maybe a sensor.

SC320CDI

I have used a spreadsheet to keep up with every drop of fuel put into my diesel since I bought it last January. I also reset the computer at each fill. The computer has consistently indicated 94% of actual as calculated on the spreadsheet. I would be interested to know if there is any way to adjust the calibration of the computer.

amdeutsch

There is. I've tried to get it done as well. But dealers don't have the correct DAS version to do it.

nopcbs

There are two mileage displays of the E series you have. One resets every time you let the car sit about 4h (or when you reset it) and the other only resets when you reset it. Both are very inaccurate when first reset. MB chooses to reset to a high number (34 mpg on my 2006 E320) instead of to zero, so you have to drive quite a few miles before their "seed" number averages out of significance, unless you really are getting the "seed" mileage. Net result is that over daily short commutes the auto-reset display is wildly optimistic while the other is fairly accurate after about 30 miles, if you do not reset.

You are not getting 34 mpg highway at 70 mph with the gas engine. Simply imossable. The diesel does get that.

- GRL

Vik888

You guys can search this forum to find other posts by me about mileage on my car. The 07's and later are amazing .. great engines and transmissions. Non believers like nopcbs will be blown away.

I can get 28mpg on my E550 on the freeway at around 75mph. Thats on two 120 mile trips back to back, calculated manually, not using the car's computer, which was off by about 1.5mpg.

It wouldn't surprise me if the E350 broke 30mpg on the freeway.

stingray71

I drove from Alabama to Virginia on the highway at around 70mph. I can tell you that over the course of several hours the mpg was 33. My trip computer resets to 21.9 and then adjusts from there.

Jen_Kenne

Is that using the cruise control or your right foot? I can get close to 27 mpg using cruise at 75, but I've never seen 28.

Tjdehya

Wow, is there something wrong with my car?!? I just came back from a 250mile each way road trip and I averaged 20mpg. The trip computer said 22mpg but I calculated 20.5mpg. Cruise control and ~70mph with a couple short hits of traffic, not too many hills here in the north east so I don’t know why there is such a big difference in mpg. I have about 1100 miles on the odometer and from my experience mpg's go down as the car gets older.

adisco93

I have had my 07 E350 for a month and its only the last 3 days that i have seen anything higher than 24mpg. I saw 25 for the first time last night on my way home from work. I drive the same distance and route to and from work everyday. When i am coming home at night on the same route it seems to get better mpg than when going in the morning and my driving habits are pretty much the same. no mashing of the gas or anything like that. Weird! Is there a better way to see better numbers?

Jen_Kenne

I suggest three things. (1) More miles on the car - your's is barely run-in. (2) Verify correct inflation of the tires. (3) Manually calculate your mileage and compare that to the internal computer.

If you're running only 70 and using the cruise control, 20.5 (or 22) seems low. Other E550 experiences?

stingray71

Is yours set for Comfort (C) or Sport (S)? Mine has been set on 'C'
Not sure if the E550 has the same setting options and how this affects mileage.

nopcbs

Transmission has nothing to do with highway cruise. It just sits in top gear. Engines (except diesel) are unchanged from 2006. No reason to expect highway mileage to change...except diesel which went down slightly in 2007 vs. 2006.

28 mpg in an E550 is simply not going to happen at 75 mph. Old EPA estimate was 23 highway...and that's at a lower speed...went to 21 mpg in the revision. The thing was subject to gas guzzler tax!

E350 highway estimate was 26 and was downgraded to 24. Low thirties is simply not going to happen at 70 mph.

Remember, the original estimates were supplied by MB to EPA. They are simply not going to be as pessimistic as you say.

I'll look up what CR got, but it is not likely to differ much from old EPA and the CR number is based on careful testing.

- nopcbs

nopcbs

Old EPA estimate for E550 is 23 highway and new is 21. He is right in line with it. No mystery here. It will increase for him as he puts on some miles, of course.

- nopcbs

nopcbs

...that is LESS than the one you calculate from the odometer and the gallons you pump?

That is very unusual.

- nopcbs

nopcbs

...readout.

It is next to useless because it resets not to zero, as it should, but to a high number (I think someone said 22 mpg for the E350 and I know to 34 mpg for diesels). At some point that seed mpg will average out to insignificance, but it takes a lot of miles. For example, I NEVER see less than 25 mpg on in-town commutes on that readout in my E320 CDI and usually it tells me 27-29 mpg, but my real mileage (odometer plus fuel pumped input) was 22 mpg last time I filled up.

- nopcbs

Jen_Kenne

Vik888, The like nopcbs tend to take polemic positions -- at times, flirting with troll-like behavior. Ignore her, and just keep reporting those numbers.

Vik888

You are so ill informed its not even funny. TRANSMISSION has everything to do with it. I have a 7-spd transmission .. I can go 80 and not even break 2000rpm. The 7-spd gets better mileage than the 5-spd.

The "newer" EPA estimates are so conservative, even the most aggressive drivers in the E550 can beat them. So don't tell me what I can and cannot do in my own car.

My 2008 E550 was *NOT* subject to gas guzzler tax.

Anyway, you believe what you want. I'm not going to continue arguing with an ignorant fool such as yourself. When you get your facts straight, we can talk, until then, believe what you want based on your 2006 W211 education.

Vik888

No doubt. Ignorance is bliss.

the 5.5L V8 in the E550/S550 actually won a "green" award in Europe. V8 getting a "green" award .. funny but I can see why.