Surprising MPG

[Dr Who]

Okay, so I probably shouldn't be surprised, but I never bought the CLK for fuel economy, only to be a comfortable commuting car which returned better than my Impreza.

Done a few mixed journeys, m'way, town and A-road, and the car has been Averaging 35mpg, which for a car that is supposed to do 37.2mpg Extra Urban impressed me greatly, after all I have not been driving it like a saint. At the end of the day it is a 14 year old 3.2 V6 which is pretty heavy and was expecting a mixed mpg return of around 28mpg.

Anyone else achieved some surprising mpg results with their cars? Either good or bad

 

[Dr Who]

Thats very suprising especially as the Merc V6's are not exactly reknowned for being efficient, infact its something they were traditionally poor with in comparison to the competition.

To average 35mpg on mixed driving from a car which has an urban figure of only 37mpg is very bizarre, enough to make me question the accuracy of your figures.

I agree, that is what is so surprising, I can only think that the 2 motorway journeys combined have pushed up the element of extra urban mpg in the mix.

My calculation was based on total cost of fuel/cost per litre/4.546 = gallons used divided into the total mileage between fills.

I cannot think what I may have done incorrectly, but I am all ears (this has been done over 2 tanks of fuel and has returned the same figures on both tanks). I can accept one might be a miscalculation, but 2 fills of fuel?

 

[Dr Who]

The OP's are miles out.

Well they are between the average (28mpg) and the extra Urban (37.2mpg) so hardly miles out.

I will acknowledge that there has been a markedly more m'way and dual carriageway, but I would be surprised if it was all m'way and it got to 37odd.

I have used exactly the same method to measure mpg for years, which is why I always fill my tank and do the calculations, I did it over 2 tanks with similar journeys. The previous fills have been all urban and it has returned @22.mpg over those, which is around what I would expect.

Accuracy of odometer? Well the route planner has matched the mileage my odometer has increased over planned journeys to within a mile.

 

[Dr Who]

I suspect then that the 'urban' usage was very little, in which case it makes more sense. Especially as you know you get 22 around town, it wouldnt take many miles @ 22 to drag that average right down.

I agree, it was the much smaller element, but I am more surprised by the fact it is a 14 year old, presumed very uneconomical car which is getting close to its official extra urban figures. The surprise being that it must still be in a very good state of tune.

The mix of miles I have done recently was Street to Cardiff centre and back, and then Street to Axminster and back. so town miles about 10 out of 265 and A roads (dual and single carriageway) about 110 out of 265.

But like I say, the biggest surprise is not the vicinity to official figures, as I often achieve that in my cars, it is the fact that it is an old car that can still get close to official figures.

 

[Dr Who]

Very impressive, how many miles has it done?

74,100 so far.

 

[Dr Who]

Is this on the trip computer or calculated?

If you read my posts you will see http://forums.overclockers.co.uk/showpost.php?p=22581389&postcount=11

 

[Dr Who]

Chaps, we're missing something here. It's a 14yo CLK so it's probably shed half it's weight in rust.

You would think so wouldn't you, but actually someone had it treated in the past and resprayed, so there is only one minor patch on the front wing