Mpg reduced by 10-12mpg

[Bruce Lea]

Hi, was getting high 50s mpg but dropped to 45mpg despite using texaco 99. 

Probably down to the cold weather.

 

Another thing the sometimes when stationery sounds like it's revving and not switching off to go into EV mode

[Saxmaniac]

Temperature accounts for 8 to 10mpg, but running the heater from cold causes the engine to run just to supply heat which may be why you hear it running for no apparent reason. Best leave heating off for the first couple of miles 

[Roy124]

My Yaris Cross has shown a steady month on month drop from 66 in September to 56 on January.  December was the  low point and January better with the milder weather and some journeys in mid 60s. 

I expect the current cold spell will cause it to drop again. 

[Bruce Lea]

You'll have to put heating on first when starting up in mornings to heat clear windscreen/car, you've no choice other than sit in a cold drive

[MagicBoy]

Yeah, it's the cold weather. I was out in the -9C we had a few weeks ago and even with it being garaged the ICE was continually running for a good 10 minutes just to try and get warmed up. That was with the cabin heating off, and the seat heaters on. The weather, plus E10 and I'm seeing 44mpg average for the last tank.

It's about the only time I've missed my old Skoda diesel and it's blast furnace of a heater. 😄

[Roy124]

John, you remind me, back in the 50s you could get a sump heater, a low paraffin heater that sat under the sump to keep the winter grade oil liquid.  In the 60s and 70s SAAB had electric oil and water heaters and a washer heater which was a simple heat exchanger connected to the coolant pipe from the engine. 

Same era, Ford had a trickle charger that was fitted under the bonnet.  Same appearance and size as the coil. 

[MagicBoy]

We found a paraffin sump heater in the garage when we cleared my Grandfathers house out a few years ago. Mum remembered him using it on his Humber Super Snipe in the early 1950s.

[DaddyBaddy]

@Bruce Lea This is not uncommon or abnormal for a hybrid during cold weather. I see the same results with my 2016 Auris Excel Hybrid hatchback. Nothing to worry about. 

[AisinW]

Yes, it's normal because of longer ICE cycle to reach ideal temperature in your trips.

When the coolant is 70C and warm, the mpg will be good again. 

Especially if you turn the heater on, the computer will force ICE to heat the coolant. The heater is mainly provide by the engine heat. 

[Guest]

On 1/17/2023 at 1:24 PM, Roy124 said:

In the 60s and 70s SAAB had electric oil and water heaters

Kenlowe (I think?) made a mains unit that plumbed into the heater hoses. I did fit and use one with a Peugeot Diesel Family Estate car in the early 90s. I wish I still had that, best and most reliable car I have ever owned bar non. It contained a heating element and circ. pump. A conveniently fitted socket was connected to an extension lead about 10 minutes before lift off. Engine coolant suitably hot and instant heater. It might still be in my shed!

An excellent device until you forget and drive off with it still plugged into the extension. Don't ask.

I remember those sump heaters too. I wonder if any cars combusted when they were in use?

[Roy124]

7 minutes ago, newagetraveller said:

An excellent device until you forget and drive off with it still plugged into the extension. Don't ask.

In one job our Standard Vanguard Estates where plugged in every night.  They had snatch cables so we could drive off without unplugging. 

Occasionally the disconnect was on the wall side and not the frame.  As you say, don't ask 😁

[MagicBoy]

51 minutes ago, Roy124 said:

In one job our Standard Vanguard Estates where plugged in every night.  They had snatch cables so we could drive off without unplugging. 

Occasionally the disconnect was on the wall side and not the frame.  As you say, don't ask 😁

RAF?