|
S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
Information |
|
Plummeting fuel consumptionViews : 2265 Replies : 27Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Aug 24th, 2022, 17:02 | #11 |
Senior Member
Last Online: Today 16:15
Join Date: Mar 2021
Location: Gravesend
|
Bring up mpg avg on dash, press reset on the lower part of the left stalk, and Bingo, Bob’s your aunties fancy man. No need for Vida. BUT do it when you fill up, and clear it every time you fill up, you get to see if somethings wrong very quickly.
Last edited by yostumpy; Aug 24th, 2022 at 17:04. |
The Following 4 Users Say Thank You to yostumpy For This Useful Post: |
Aug 25th, 2022, 09:42 | #12 |
SimboC2004
Last Online: Apr 27th, 2024 08:38
Join Date: May 2019
Location: Diss
|
My average fuel consumption has dropped to saying 29mpg following a 700 mile round trip towing my caravan (and with roof box on) to France and it has remained at that figure since reverting back to "normal" car. It has also said 290 miles remaining for the last tank of fuel - from full down to 1/4 of a tank! So, about to try reset suggested by Yostumpy - and will try to remember to do that for every refill...
Interestingly, I discovered in that trip above - with temperatures well over 30C for the whole time - a new error message on the dash display: "Shift down due to Heavy Load" that appeared fairly frequently (as well as "Slow down due to high engine temperature" on one occasion). Had never seen either message before, though both made sense - the car seemed quite happy in a higher gear, but I guess the engine management system didn't agree!
__________________
Volvo V70 P3 ES D3/D4 2011 - 170,000 miles in Black Stone Volvo V40 R-Design Nav Plus D4 190 - 60,000 miles in Osmium Grey Past: '90 944 2.0 turbo, '91 944 2.0, '92 945 2.0 turbo, '95 945 2.3 HPT, '09 C30 2.0D R Design 180bhp+, '13 C30 D2 Lux. |
Aug 25th, 2022, 11:43 | #13 | |
Extrahumanestrial
Last Online: Feb 13th, 2023 19:02
Join Date: Jun 2022
Location: Budapest
|
Quote:
If you're automatic that's the gearbox overheating. Might be time to have it's oil changed or ensure you aren't towing something too heavy for the car. |
|
The Following User Says Thank You to SnineT For This Useful Post: |
Aug 26th, 2022, 17:30 | #14 |
SimboC2004
Last Online: Apr 27th, 2024 08:38
Join Date: May 2019
Location: Diss
|
It's a manual and we tow an Eriba - 1000kg max loaded and a pop top roof, so much smaller profile when towing. I use cruise control a lot - which may well be the reason... plus those high temperatures.
But then... my fuel consumption is still staying below 30mpg average (on the instrument panel), so I'm thinking there may be an error in the engine management somewhere? Time to find where I put my VIDA Dice...
__________________
Volvo V70 P3 ES D3/D4 2011 - 170,000 miles in Black Stone Volvo V40 R-Design Nav Plus D4 190 - 60,000 miles in Osmium Grey Past: '90 944 2.0 turbo, '91 944 2.0, '92 945 2.0 turbo, '95 945 2.3 HPT, '09 C30 2.0D R Design 180bhp+, '13 C30 D2 Lux. |
Aug 26th, 2022, 20:16 | #15 |
Premier Member
Last Online: Yesterday 13:12
Join Date: Aug 2008
Location: Newcastle
|
Have towed a Compass 510/5 caravan for 20 years with 4 different volvo V70. Always travel at legal max mostly A roads and have never had overheating issues. Strangely the diesels lost the most Mpg when towing over the petrol.(all 5/6 speed manuals) current 215HP D5 will return 33/5 mpg towing. (Computor) 50mpg solo.
Cheers Bob |
The Following User Says Thank You to 100K+ For This Useful Post: |
Aug 31st, 2022, 08:12 | #16 |
SimboC2004
Last Online: Apr 27th, 2024 08:38
Join Date: May 2019
Location: Diss
|
I think my computer has gone doo-lally... I reset the average on the last fill up, it then told me I had 290 miles remaining for the entire time I was away (with the caravan) over the weekend (about 150 miles done). On return I have been into work and back a couple of times (60 mile round trip) and the tank gauge now shows just under 3/4 and the average reads 430 miles to empty... Bizarre
__________________
Volvo V70 P3 ES D3/D4 2011 - 170,000 miles in Black Stone Volvo V40 R-Design Nav Plus D4 190 - 60,000 miles in Osmium Grey Past: '90 944 2.0 turbo, '91 944 2.0, '92 945 2.0 turbo, '95 945 2.3 HPT, '09 C30 2.0D R Design 180bhp+, '13 C30 D2 Lux. |
Aug 31st, 2022, 09:37 | #17 | |
Member
Last Online: Apr 25th, 2024 14:35
Join Date: Aug 2021
Location: Manchester
|
Quote:
Then, when you remove the caravan, your mpg will rise, and after a few miles of that, your range on the tankful will start to climb, based on your 'average' mpg which has now climbed back towards normal (ie, once you've done >30 miles without the van on the back). |
|
The Following 2 Users Say Thank You to Cloth Ears For This Useful Post: |
Aug 31st, 2022, 12:12 | #18 |
SimboC2004
Last Online: Apr 27th, 2024 08:38
Join Date: May 2019
Location: Diss
|
Yes, that makes sense, however it doesn't seem to change at all for several hundred miles, then leaps up (or down), so i'm not sure how often it actually makes the calculation.
I have just filled up and reset. Mileage travelled since last filling was 240 and fuel put in to first pump click was 5.7 gallons (26litres), which means an average of 41.9mpg - not the 29 mpg it told me I was averaging... and 110 miles of that was towing the caravan (from my caravan tracker).
__________________
Volvo V70 P3 ES D3/D4 2011 - 170,000 miles in Black Stone Volvo V40 R-Design Nav Plus D4 190 - 60,000 miles in Osmium Grey Past: '90 944 2.0 turbo, '91 944 2.0, '92 945 2.0 turbo, '95 945 2.3 HPT, '09 C30 2.0D R Design 180bhp+, '13 C30 D2 Lux. |
The Following User Says Thank You to simboc2004 For This Useful Post: |
Sep 1st, 2022, 11:51 | #19 | |
Senior Member
Last Online: Today 15:01
Join Date: Feb 2014
Location: Lichfield
|
Quote:
Diesel engines give great economy when running at very high Air to Fuel ratios (AFR). When you are towing the engine is under greater load, so lower AFR and therefore much less efficient. Petrol engines under load run at the same AFR due to the catalytic converter requirement. Under more load the throttle opening is greater which reduces the pumping losses from the throttle restriction in the inlet. So more fuel needed for more power/torque, but reduced losses from inlet throttling. |
|
The Following 2 Users Say Thank You to FreshAir For This Useful Post: |
Sep 3rd, 2022, 02:36 | #20 |
Junior Member
Last Online: Apr 6th, 2024 21:59
Join Date: Apr 2017
Location: Newport
|
I thought this was standard practise? With whatever car you have. Fill up tank. Reset trips. Reset average mpg. Always do this to keep an eye on things. How many miles gone before used 1/4 tank then 1/2 tank. How to keep an eye on health of engine - when factored in with type of driving being done - long runs, short slow town trips?
Hope you get to the bottom of it and sorted without too much more hassle.
__________________
Volvo V70 D5 205 Auto Dunno much about, so going to have a mooch around. |
The Following User Says Thank You to uknowiama For This Useful Post: |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|