XC90 T8 fuel query

Lainie · Nov 17th, 2018, 13:22

Hi everyone. Received our new XC90 three weeks ago. Driving 90% of the time on electric as short journeys around town. I have downloaded our driving log and since the 1st of this month it says we have used less than 9 litres of petrol. The reality is I have put in and used approximately 35 litres.

So my question is, how accurate is the driving log? 9 litres would make more sense to me as it rarely switches to petrol. The fuel gauge drops by 30 miles or so over a 24 hour period of driving in pure. We pre-condition whilst plugged in.

Many thanks!

Philip Fisher · Nov 17th, 2018, 14:47

This isnt a UOM issue is it? 9 gallons is close to 35 litres......

MaDProFF · Nov 17th, 2018, 17:45

Aux hearter uses fuel

Philip Fisher · Nov 18th, 2018, 09:34

Quote:

Originally Posted by MaDProFF

Aux hearter uses fuel

But that much?

MaDProFF · Nov 18th, 2018, 09:38

TBH the OP has not really given us much to go on, for a start how many miles overall we talking about driven in the 3 weeks?
Also precondition, I assume op means parking climate, so that uses fuel too to heat up the car? Again how often are we talking about?

Lexman8 · Nov 18th, 2018, 10:21

At max output the aux fuel heater uses ~0.2 litres per 20 minutes of operation which would cost ~£0.25. Pre-heating a D5 or T6 will reduce the fuel consumed by the engine (as it won't be cold) and so the net cost will be less*. I guess the benefits for a T8 will depend upon how it's used.

So one scenario would be that the OP used 9 litres of fuel for driving and 26 litres for aux heating which would equate to roughly 43 hours of (pre)heating. This seems unlikely.

Does the T8 use the aux heater for cabin heat even when driving in all-electric mode?

*The aux heater manufacturer says: Approx. 20 - 40 % of the quoted fuel consumption is compensated by the lower consumption of your pre-heated engine.

Philip Fisher · Nov 18th, 2018, 10:56

Quote:

Originally Posted by Lexman8

Does the T8 use the aux heater for cabin heat even when driving in all-electric mode?

Put simply, Yes.

Daveh1000 · Nov 18th, 2018, 20:45

Ah thanks, I thought so got back from a short journey on pure and noticed there was the same smell when it gets pre conditioning

Lainie · Nov 19th, 2018, 13:47

Thank you for your replies.

Definitely all in Litres.

For heating I have the fan on the very lowest setting and have the temperature at 20, so no excessive heating.

Don't get me wrong, my fuels costs are considerably less than previously, but the driving log data and my real-life experience seem vastly different. And like one user mentioned 43 hours of pre conditioning seems very high (in which case I won't precondition!)

Lainie · Nov 19th, 2018, 13:49

Just to add, I have preconditioned approximately 10 times in the last 19 days

Nov 17th, 2018, 13:22	#1
Lainie New Member Last Online: Nov 30th, 2018 10:32 Join Date: Nov 2018 Location: Cambridge	XC90 T8 fuel query Hi everyone. Received our new XC90 three weeks ago. Driving 90% of the time on electric as short journeys around town. I have downloaded our driving log and since the 1st of this month it says we have used less than 9 litres of petrol. The reality is I have put in and used approximately 35 litres. So my question is, how accurate is the driving log? 9 litres would make more sense to me as it rarely switches to petrol. The fuel gauge drops by 30 miles or so over a 24 hour period of driving in pure. We pre-condition whilst plugged in. Many thanks!

Nov 17th, 2018, 14:47	#2
Philip Fisher Premier Member Last Online: Today 10:56 Join Date: Dec 2002 Location: Sheffield	This isnt a UOM issue is it? 9 gallons is close to 35 litres...... __________________ Currently:- MY16 XC90 T8 Momentum, Magic Blue 174k miles. MY17 V60 T4 Power Blue. Previously:- 1997 V70 T5 exPolice; 2005 V50 2.0D; 2013 XC70 D5

Nov 18th, 2018, 10:21	#6
Lexman8 Premier Member Last Online: Today 15:24 Join Date: Feb 2016 Location: Yorkshire	At max output the aux fuel heater uses ~0.2 litres per 20 minutes of operation which would cost ~£0.25. Pre-heating a D5 or T6 will reduce the fuel consumed by the engine (as it won't be cold) and so the net cost will be less. I guess the benefits for a T8 will depend upon how it's used. So one scenario would be that the OP used 9 litres of fuel for driving and 26 litres for aux heating which would equate to roughly 43 hours of (pre)heating. This seems unlikely. Does the T8 use the aux heater for cabin heat even when driving in all-electric mode? The aux heater manufacturer says: Approx. 20 - 40 % of the quoted fuel consumption is compensated by the lower consumption of your pre-heated engine. __________________ MY17 XC90 D5 Powerpulse Momentum: SENSUS, Osmium Grey, Blond, Walnut, Xenium, BLIS + CTA & RCM, Winter Plus, Fuel-fired Heater, Heated Rear Seats, Power Extensions, Tinted Windows Coming soon: XC60 Ultimate Recharge MY24 or 25 or... Last edited by Lexman8; Nov 18th, 2018 at 10:32.

Nov 17th, 2018, 17:45	#3
MaDProFF Master Member Last Online: Dec 10th, 2019 17:40 Join Date: May 2018 Location: London	Aux hearter uses fuel

Nov 18th, 2018, 09:38	#5
MaDProFF Master Member Last Online: Dec 10th, 2019 17:40 Join Date: May 2018 Location: London	TBH the OP has not really given us much to go on, for a start how many miles overall we talking about driven in the 3 weeks? Also precondition, I assume op means parking climate, so that uses fuel too to heat up the car? Again how often are we talking about?

Nov 18th, 2018, 20:45	#8
Daveh1000 Junior Member Last Online: Apr 6th, 2022 20:55 Join Date: Oct 2017 Location: TBA	Ah thanks, I thought so got back from a short journey on pure and noticed there was the same smell when it gets pre conditioning

Nov 19th, 2018, 13:47	#9
Lainie New Member Last Online: Nov 30th, 2018 10:32 Join Date: Nov 2018 Location: Cambridge	Thank you for your replies. Definitely all in Litres. For heating I have the fan on the very lowest setting and have the temperature at 20, so no excessive heating. Don't get me wrong, my fuels costs are considerably less than previously, but the driving log data and my real-life experience seem vastly different. And like one user mentioned 43 hours of pre conditioning seems very high (in which case I won't precondition!)

Nov 19th, 2018, 13:49	#10
Lainie New Member Last Online: Nov 30th, 2018 10:32 Join Date: Nov 2018 Location: Cambridge	Just to add, I have preconditioned approximately 10 times in the last 19 days

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