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Home > Technical (L322) > Drop in MPG after DPF reconditioning

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Roystonh

Member Since: 21 Nov 2011
Location: Kent
Posts: 395

Drop in MPG after DPF reconditioning

My DPF was over full due to failure or sensors so I had it removed, cleaned out and refitted. MPG has dropped from 31 to 27 (4.4 TDV8) - any ideas why? Cheers Roy 2005 L322 Vogue Gold gone
2006 L322 Vogue Black gone
2011 L322 Vogue Silver gone
2011 L322 Autobiography Black gone
2015 L405 Autobiography LWB Black gone
2019 L405 P400e Range Rover Autobiography LWB Eiger grey / black roof gone
2001 P38a 30th Anniversary Wimbledon Green gone
2019 L405 P525 Autobiography LWB British Racing Green

8th Jul 2018 5:01pm

stan
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Member Since: 13 Jul 2010
Location: a moderate moderated moderator moderating moderately in moderation
Posts: 35114

is that computer or proper mpg...it could be that the car's computer is calculating the mpg in correctly now the dpf is gone..

i would fill to the brim , and then check a week later and calculate using the amount of fuel to fill up again against the miles traveled.... ... - .- -.

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8th Jul 2018 5:13pm

Roystonh

Member Since: 21 Nov 2011
Location: Kent
Posts: 395

Computer MPG Stan - just filled up 530 miles in tank now 2005 L322 Vogue Gold gone
2006 L322 Vogue Black gone
2011 L322 Vogue Silver gone
2011 L322 Autobiography Black gone
2015 L405 Autobiography LWB Black gone
2019 L405 P400e Range Rover Autobiography LWB Eiger grey / black roof gone
2001 P38a 30th Anniversary Wimbledon Green gone
2019 L405 P525 Autobiography LWB British Racing Green

8th Jul 2018 5:27pm

ilard

Member Since: 21 Oct 2012
Location: London
Posts: 703

stan wrote:
is that computer or proper mpg...it could be that the car's computer is calculating the mpg in correctly now the dpf is gone..

i would fill to the brim , and then check a week later and calculate using the amount of fuel to fill up again against the miles traveled....

He did say DPF has been refitted.

But I am wondering how like-for-like trips are being used to calculate the computer's MPG. It's a relatively minor difference 31 to 27 and could simply be down to traffic or temperature (aircon etc) or averages over a greater period of miles travelled.

9th Jul 2018 9:18pm

Roystonh

Member Since: 21 Nov 2011
Location: Kent
Posts: 395

Always been fairly light on the peddle so driving style is the same. Only difference has been the recent weather, will continue to keep an eye on it 2005 L322 Vogue Gold gone
2006 L322 Vogue Black gone
2011 L322 Vogue Silver gone
2011 L322 Autobiography Black gone
2015 L405 Autobiography LWB Black gone
2019 L405 P400e Range Rover Autobiography LWB Eiger grey / black roof gone
2001 P38a 30th Anniversary Wimbledon Green gone
2019 L405 P525 Autobiography LWB British Racing Green

10th Jul 2018 9:00pm

GGDR

Member Since: 26 Nov 2016
Location: London
Posts: 3523

2011 Range Rover Vogue SE TDV8 Stornoway Grey

Roystonh can you give details of your DPF clean pls?
Cost would be good to know, are you happy with the job and the firm?
About to get mine done.
Cheers,
Greg Cheers, Greg
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2011 Vogue SE 4.4 with lots of toys in Stornaway

10th Jul 2018 9:12pm

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