Definitive answer to "what mpg will I get from my 55k engine"

[Silver CL55]

60,000 miles, 18.8mpg

 

[John]

Mine is almost on exactly the same mileage as yours - and my last manual calculation was 18mpg.

However, my computer reckons 20mpg so not sure if you know whether your computer is accurate!

 

[Adam230K]

thats actually very good considering its power - my v8 only got 21mpg, over the whole time i had it (just over 20k miles) and yours has 200bhp more!

 

[donshl]

According to the OBC, mine recently got 22mpg with 28mph average speed

 

[230K]

Hi

Interesting that you have covered 59880 miles but only 59876 miles are recorded.

230K

 

[John]

thats actually very good considering its power - my v8 only got 21mpg, over the whole time i had it (just over 20k miles) and yours has 200bhp more!

My Alpina with 347BHP did 21mpg.

Seems to be standard issue for that 4.4/4.6 engine.

 

[Dieselman]

thats actually very good considering its power - my v8 only got 21mpg, over the whole time i had it (just over 20k miles) and yours has 200bhp more!

but He's not using the extra 200 Bhp when driving. It doesn't matter how much power an engine can produce if the car only needs 60 hp to power it down the road.

60Hp is enough to get to 100mph.

 

[Adam230K]

My Alpina with 347BHP did 21mpg.

Seems to be standard issue for that 4.4/4.6 engine.

You may be right, even the E60 version of this engine which has all kind's of throttle control & valve timing tech still was achieving 11l/100km over about 3k km (~20 mpg i think)

To be fair though i've never heard of any V8 average anything over 23/24mpg in reality, not book figures of course.

 

[Adam230K]

but He's not using the extra 200 Bhp when driving. It doesn't matter how much power an engine can produce if the car only needs 60 hp to power it down the road.

60Hp is enough to get to 100mph.

I understand what you mean, but the state of tune of an engine does play some role in its minimum consumption I would've thought.

I only say this because I know people with their 2ltr Jap rockets, everyday consumption for them is 20mpg, on a 2ltr 4cyl engine producing 400bhp - if you take that engine in its standard state, it will be in the 30's!

But mercedes do tend to produce relaxed engines. Look at the M5 V10 for example, it has the same power but it will never achieve the same figures as the 55K engine, because of its state of tune.

 

[Dieselman]

That's because they have to run in a low gear to get enough torque, or because they have drooped out of the bottom of the usable torque range.

The only variable with a large standard engine is internal friction caused by more cylinders.

 

[ACID]

I get local around 10mpg and motor way 26mpg

 

[Bryan Allman]

Mine is on 77k and since I bought it at 37k has averaged 20.1mpg in the 2.5yrs (average 16000 pa mixed motorway and urban - probably 50/50 split). As I tend to 'press on' I think thats not too bad

The problem is, there is really nothing to replace it in terms of comfort and Q Car performance - I guess I will be keeping it for a while

 

[Adam230K]

That's because they have to run in a low gear to get enough torque, or because they have drooped out of the bottom of the usable torque range.

The only variable with a large standard engine is internal friction caused by more cylinders.

Wait so how do you explain the horrible consumption on the V10 M5 compared to an equally powered car, like the E55K or the E63? all producing the same power, but the M5 drinks a notorious amount.

A bit like ferraris and lambo V8's too, they always seem to achieve single digit mpg's, it must have something to do with their design don't you think?