Hi All,

My Fatty is a motorway queen. I travel from London to Pembroke every week and it is a total is 500-520 miles round trip. I sit in the top lane with radar cruise set at 80 leptons and I normally get 36 mpg, which is almost a full tank and has about 40-60 mile range when I get back home.

Last few weeks the car is struggling to get 31+ which is a significant drop. Can I simply put this down to winter diesel?

Car performance and drives like brand new, with 135k on the clock and I think she will do another 135k with ease.

Any thoughts welcome. I've been doing this trip for the last 12 months so something is definitely off.

IceBoy

Winter diesel would be my prime suspect. 2012 Vogue TDV8 in Aintree green

Check to see if any of your wheels are warm - might be a slightly binding calliper.

I assume your true pressures are within range too.

(Start with the cheap stuff first lol)

Dave

 All things transport - big or small, UK or planetwide.
E-mail info@md-couriers.co.uk

Tyre pressures are good but I will check to see if the callipers are binding...good shout.
IceBoy

How scientific is your recording… are you going by the dash or a physical refill and number crunch?

If winter diesel caused such a drop off, which I doubt, the haulage industry would be screaming for change to get back the missing 12% drop off, in economy.

its more likely the drop off in efficiency with cold engines, diesel engines take an age to thoroughly warm up. Truck engines shouldn't ideally ever get cold. First time FFRR owner

I'm surprised with you getting 36mpg at 80mph from the SDV8.

I measured mpg regularly using the full to full method over 4 and half years (it always said slightly better mpg on the computer than I could get in real life).

My normal mpg was about 28-29, although I could get 32 on a run. The best I got was 33.25 when I kept the speed below 70mph (the computer said 36.0). Current:
- 2017 L405 3.0 V6 Autobiography
- 2013 L405 4.4 TDV8 Vogue [For Sale]
Sold:
- 2004 L322 4.4 Vogue (BRC LPG)
- 2002 L322 4.4 HSE (having fixed timing chain guides)
- 2000 P38 4.6 Vogue (BRC LPG)
- 1981 2-door In-Vogue
- 1980 Ex-Army SIII LWB
- 1976 SIII LWB
- 1968 SIIA
Stripped for parts:
- 2003 L322 4.4 Vogue

I think the FBH must add quit a bit to total fuel consumption at this time of year

Dpf regening more than it should be? Cheers

James