Just returned from a long weekend in Montreal. Filled up just as we were getting on the highway. It's about 330 miles from Toronto to Montreal, mostly flat and traffic is not too bad once you're out of the city. Had the cruise on about 70 most of the way up and the same on the way back today. Didn't make it all the way there and back on a single tank, but here are my stats for the fill up on the way back.

Distance between fill ups 879.7km - 546.6 miles
Fuel consumed - 69 Litres - 18.2 gallons

Comsumption 9.2l/100km or 30mpg.

I thought that was pretty decent for a 9 year old car with a "thirsty V8" in it.

I know this doesn't compare well with the diesel or Smart car crowd, but I was pleased with it.

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired

Well, that would be factoring in the imperial gallon. Using American gallons it would come out to 26 mpg.

Still pretty good for a 4.3 liter V8 engined car weighing almost 2 tons.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)

If those are canadian liters... I think it's us gallons... 18.27 so 29.91 mpg ... close enough.

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-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13
http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14

Not bad at all, who says 8 bangers are pigs. Even the new Corvette's get mid 20's,

I can get 23mpg with the cruise set at 75 in the S600. Did it when I drove it home from Chicago last summer.

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'07 Yukon 2500
'13 Subaru Outback 3.6R
'13 Orbea Carpe 9-speed

Currently Benzless
Formerly: 300TD, S600, E55, 560SEL

---= The forest breathes, listen.
-Native American elder

A liter is a liter. It is a universal volumetric standard.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)

A liter is a liter, but a gallon isn't necessarily a gallon. I think a US gallon is 3.7855 litres, which is the figure I used to convert.

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired

You are right. That's the figure.

So, 9.2 / 3.7855 = gallons per 100 km...

Figure is 2.43 gallons per 100 km.

There are 62.1 miles per 100 km. So, 62.1 / 2.43....

...The answer is: 25.55 mpg.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)

Jason,

Something isn't hanging together here. The 69 liters/879.7 km = 7.84 l / 100km not 9.2/100km. The miles and liters you quote would indeed give you the 30 mpg which honestly is hard to believe but that is what the numbers say. On the other hand as pointed out above the 9.2/100 km is around 26 mpg which is more in line with expectations. So what are the raw numbers you used?

26...30...whatever...still impressive for a V8.

I'm still trying to top 21 mpg on the ML350...in VAIN I might add!!

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car

I have noticed the same thing with my 430 - impressive mileage for a V8. If I drive hard in the city, the mileage drops accordingly. However, cruising on the highway, I'll get close to the same mileage as the V6 of the same vintage, around 9-10L/100Km.

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Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired

"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon

You're right, it should have been 7.8l/100km. I keep a spreadsheet that I update everytime I fill up and it says 7.8 (I copied off the wrong line when I typed in 9.2).

For further info, the worst milleage I've gotten from a tank was 15.2mpg from a tank that was all city driving in the dead of winter. My average is 21.5mpg since the beginning of 2006.

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Jason Priest
1999 E430
1995 E420 - retired
1986 420SEL - retired

Nice..... I have been considering a S430 and one the reasons is its exceptional (for a big car) mileage.

In that case, that's awesome!

I think I got about 28 mpg once with my '97 E420 with average speeds ranging from 70 - 75 mph. Usually I got about 25 - 26 mpg around that speed.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)

It is my belief that the MB 6's and 8's were designed to cruise at autobahn speeds at 2600-2800 RPM's in a power band that was designed to give the max MPG/KPL possible (given the limitations of the FI system and engine component weights).

Example: My 300E M104 gets 32 to 30.5 MPG at 75 MPH when on cruise from NYC to Charlottesville-more than my Volvo 240 2.3 I4 less 500 lbs of chassis weight-same road, same gas, 500 lbs heavier but still beat my 240 by 4 to 6 MPG.

If you drive it in a consistent pattern, moderate accelleration, go to cruise when you get to 55 and use the cruise accelleration controller to reach 75 and then just hang out, your MPG/KPL will be consistentky in the top end of the MPG/KPL curve.

I did a project for eng class on drag associated with suinroofs and open windows at 75 MPH and found the loss of MPG/KPL to be less than 1 MPG/1.4KPL over 600 miles (longest I could drive without stopping for gas/human system fluid drain).

go figure...

I bet the gas tank also gets topped off at different levels
each fill up. One more random factor , tailwind etc.

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cult plus time equals religion