Yes 4.2 SC 17mpg around town and 22 on a run so no better or worse than it ever was

moparmuff wrote:

Yes 4.2 SC 17mpg around town and 22 on a run so no better or worse than it ever was

Iam slowly coming to the conclusion I have an issue with mine and its poor economy ..... keep them coming ! Why?.. Because i can....
RRS 2006 S/C Rimini Red Weekend toy
Subaru impreza 1998 2.0 340hp still here
Smart car 0.7 61 hp Carbon offset
Sierra cosworth 2.0 350 hp GONE
Various RS escorts, Vauxhall sri's Volvo T5's, BMW 3 series, fiestas (?) fiat's....
Mr Mischief - www.mischief-inc.co.uk

moparmuff wrote:

Yes 4.2 SC 17mpg around town and 22 on a run so no better or worse than it ever was

What?
I am not able to get it over15 mpg on my 4.4 91 BMW 850CSI

I average 15.6 MPG around town in my SC. Have seen 26 on a long run, I put that down to it not reading right tho

Since I got the S/C in September I'm getting 10.3mpg according to the onboard computer. Almost all in town.

TDV8 getting around 24ish now its got colder Dave
Range Rover Sport 3.0 TDV6 HSE
Range Rover Sport 3.6 TDV8 HSE Gone
Discovery 3 TDV6 HSE Gone
Discovery 300 TDi ES ( Cambelt snapped ) Gone
Discovery 200 TDi ( Gear box fell to bits) Gone

Tdv6 getting about 26mpg, down from 28 a few months ago. Assume it's a combination of fuel burning heater and electric seats, headlights ect. Same thing happened last year. I am going to investigate whether the fbh is switching off correctly.

FF1078 wrote:

You all should get better fuel economy in cold weather as all internal combustion engines run more efficiantly on colder densor air, that is why intercoolers where introduced,even petrol engines like colder densor air.

Have noticed a decline in mine recently, as you say RRSTDV8, seats, screens, heaters, all kill the milage so it's not all the bad weathers fault, but a change in habits too.  ON THE WAY: BMW F21 M140i
MERCEDES GL350 - Metallic Navy Blue w/Grey interior

GOING: BMW F31 335D MSport+ xDrive Touring
GONE: Land Rover Discovery 4 HSE - Stornaway Grey w/Black Interior (wish we'd kept it )
GONE: BMW F10 520D MSport - Carbon Black
GONE:MY12 RRS SDV6 HSE Sumatra/Ivory/Grand Black Privacy glass

17mpg in town for sc? find it hard to believe!

I wanted to talk mpg for a long time. First of all, I think mpg reader is a very biased thing. Have you ever noticed that when waiting at traffic lights the current fuel consumption goes down to 0 mpg? Logically you burn no fuel when stationary, however it reads quite opposite. This affects the actual reading quite a bit. Moreover, to get a true reading of mpg around town/motorways one should never reset the reader. Mpg is an average. For those who are not familiar with maths there is a "law of large numbers" which essentially states that to get a true average you need a large sample. You can have a busy week and therefore travel quite a bit and perhaps in a hurry, or you may travel less and have a more relaxed driving style next week. Thus you'll get different averages. So, do not reset your mpg reader every tank/week/journey. Avoiding resetting the reader often will also reduce the effect of 0 mpg when stationary.

Having said this, I have 5l supercharged and I get around 14.2mpg nowadays, but that is because I travel with my dog almost every time. Before that I was getting around 10mpg. Vadim A.

A while back I uploaded my map and re-set my mpg counter at the same time, this was followed by 3 days of short journeys into town at rush hour... my mpg struggled to top 19 in those 3 days.

Once I was back to my normal 30 minute commute (B roads and A roads with no queing) it's back up to 24-25, which is where it always levels off to.

Not noticed any real change in mpg since the weather turned cold mind you, but I do not use the heated seats much. RRS gone
Audi SQ5...Gone Audi Q7 S-Line 240 3.0TDI Gone
Audi A6 Allroad Sport 270 3.0TDI

13 to 15 mpg for my sc
makes a huge difference where you live to your mpg, I live in a hilly area, but when i was in norwich in October, i was averaging 20mpg even with regular town travel.
Also you get a better mpg and power in summer, if your sc coolant pump is wired the right way round. Most (Pre09) of them are not.

Interesting differences from all the cars. My last tank full on a TDV8 was a mostly short runs of about 3- 12 miles and one long 120 miler on motorway returned 23.2 mpg.

Mine finally dropped to an averge of 7.9 mpg.. so decided its time for action.


Just changed air filter and maf sensor on my s/c, reset average mpg and after 50 miles of local town driving, school runs and no driving over 50mph i'm now up to 11mpg at the moment

Allegedly my s/c was serviced 8months ago, but it seems the air filter may have been overlooked

Will continue to monitor,, wondering if an ecu reset is worthy of a try? Why?.. Because i can....
RRS 2006 S/C Rimini Red Weekend toy
Subaru impreza 1998 2.0 340hp still here
Smart car 0.7 61 hp Carbon offset
Sierra cosworth 2.0 350 hp GONE
Various RS escorts, Vauxhall sri's Volvo T5's, BMW 3 series, fiestas (?) fiat's....
Mr Mischief - www.mischief-inc.co.uk