Fuel economy

Tony blomfield · Feb 6th, 2019, 20:43

My alternator failed and I had a new 150 amp one fitted, unfortunately my 2.0 diesel V50 lost its immobiliser setting and the car wouldn't start, I also had a new fuel filter fitted, but the car had to go to a Volvo independent and be reprogrammed whatever that is, now fuel economy is down, it used to average 69 mpg on a run and 44 round town but it seems quicker than it was and it's down to 58 and 40 respectively, anybody got any ideas why

The Thong · Feb 6th, 2019, 21:44

Is that according to the trip computer? I never believe the cars MPG calculation. Log the start mileage after filling up and then log the mileage on the next fill up and calculate your mpg that way, it’ll give you an accurate reading. My mpg meter used to say 63mpg, when I did a tank to tank calculation I was getting between 49 - 56 mpg and on combined 42 - 44mpg.

TT

GSB · Feb 6th, 2019, 21:44

Is that economy as displayed on the dashboard, or economy as measured from tank full to tank full over a decent distance?

Feb 6th, 2019, 20:43	#1
Tony blomfield New Member Last Online: Feb 6th, 2019 20:57 Join Date: Jan 2019 Location: Bradford	Fuel economy My alternator failed and I had a new 150 amp one fitted, unfortunately my 2.0 diesel V50 lost its immobiliser setting and the car wouldn't start, I also had a new fuel filter fitted, but the car had to go to a Volvo independent and be reprogrammed whatever that is, now fuel economy is down, it used to average 69 mpg on a run and 44 round town but it seems quicker than it was and it's down to 58 and 40 respectively, anybody got any ideas why

Feb 6th, 2019, 21:44	#2
The Thong VOC Member Last Online: Yesterday 19:25 Join Date: Jun 2012 Location: The Independent Republic of Leamington Spa	Is that according to the trip computer? I never believe the cars MPG calculation. Log the start mileage after filling up and then log the mileage on the next fill up and calculate your mpg that way, it’ll give you an accurate reading. My mpg meter used to say 63mpg, when I did a tank to tank calculation I was getting between 49 - 56 mpg and on combined 42 - 44mpg. TT __________________ Never underestimate the power of stupid. It’ can’t be reasoned or negotiated with and you’ll never never beat it…. Cut your losses, smile and walk away Currently Volvoless but Thong will be back Last edited by The Thong; Feb 6th, 2019 at 21:49.

Feb 6th, 2019, 21:44	#3
GSB New Member Last Online: Nov 12th, 2023 12:09 Join Date: Jan 2019 Location: London	Is that economy as displayed on the dashboard, or economy as measured from tank full to tank full over a decent distance?

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