Author Topic: Fuel Economy  (Read 587 times)

PMcG

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Fuel Economy
« on: 15 March 2021, 09:24 PM »
I know it's a bit of a joke with these (non-diesel) cars, but out of curiosity, what are most of you getting mpg-wise?

After driving my 450SE 6,000 miles, I've found it stays between 12-16 mpg, using non-ethanol 92 exclusively.

Is there a speed at which this car does best for gas mileage?
1976 450 SE
Diamond Blue Metallic / Navy Blue

daantjie

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Re: Fuel Economy
« Reply #1 on: 15 March 2021, 09:40 PM »
With the 6.9 you are lucky to get 8-10 mpg in town.  Freeway about 12-14.
Daniel
1977 450 SEL 6.9 - Astralsilber

ptashek

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Re: Fuel Economy
« Reply #2 on: 16 March 2021, 01:20 AM »
Euro 450SE, over the last 25k miles:

- best: 12.35 litres/100km ( 19mpg US / 22.9mpg imperial )
- average: 16.3 ( 14.4 / 17.3 )
- max: 16.8 ( 14 / 16.8 )

There's far worse figures on a few occasions, but they're mostly over very short runs, or when waking the car up after its winter slumber.

When driving long distance on ethanol free 98RON she usually stays above 16mpg US.
At top speed on the Autobahn it's below 8mpg US :D
« Last Edit: 16 March 2021, 05:12 PM by ptashek »
1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE (history, resto)

adamb

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  • 1977 450SEL6.9
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Re: Fuel Economy
« Reply #3 on: 16 March 2021, 04:11 PM »
my 6.9 - worst 9 mpg imperial, best 16 mpg imperial. Averages 15-16 in my use.

Nabstud

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Re: Fuel Economy
« Reply #4 on: 17 March 2021, 12:40 AM »
My 280S (2.8L 6cyl carby) averages 15mpg(15.5L/100km), highway or city doesn’t seem to change much. Worst I ever got was 13mpg (19.5L/100km), best is 16.5mpg (14.2L/100km).
1975 280S - Australian delivered

Mick74

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Re: Fuel Economy
« Reply #5 on: 22 March 2021, 03:15 PM »
I averaged a heady 17.6mpg (14.5 US) over my 3000 mile European trip in 2019 with 4 people and luggage on board. That was on 98 octane, though. It is usually aroung 16mpg (13.2 US) but does improve slightly on a run. Although, the last 244 miles, comprising of 7 miles to town and 7 miles back (under covid lockdown) saw an average of 14.2 mpg (11.7 US).
The best I have seen so far on one tank is 18.2mpg (15 US)
1979 6.9 #6475

Mattr

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Re: Fuel Economy
« Reply #6 on: 22 March 2021, 11:30 PM »
My 450SE 6.9 gets 8mpg. There's no range.

My 450SEL 6.9 got 14mpg cruising around, when I drove it last, and the guy I bought it from swore he averaged 16 everywhere.

Those're US gallons, btw. No British galloons here.
1976 450SE 6.9 FrankenBenz (#2288?)
1977 450SEL 6.9 #2333

BCDC

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Re: Fuel Economy
« Reply #7 on: 23 March 2021, 10:35 PM »
My advice is don’t worry about it. I get around 15L/100km using 98 octane here in Australia. Slightly better on long runs. These cars are heavy so “milage” is irrelevant. They feel the same at 160km/h as 60km/h. There is no point pussy footing around with this car, they love to rev so drive it like you want. This is exactly why they have 96 litre fuel tanks. Enjoy and pretend you don't care about the money.
1978 280SE Cream with blue interior. With SLS

Nabstud

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Re: Fuel Economy
« Reply #8 on: 24 March 2021, 05:17 AM »
My advice is don’t worry about it. I get around 15L/100km using 98 octane here in Australia. Slightly better on long runs. These cars are heavy so “milage” is irrelevant. They feel the same at 160km/h as 60km/h. There is no point pussy footing around with this car, they love to rev so drive it like you want. This is exactly why they have 96 litre fuel tanks. Enjoy and pretend you don't care about the money.

Spoken like a true car enthusiast 👍👍👍
1975 280S - Australian delivered