GS 300h fuel consumption

[In_a_state]

Hello, 

I've just bought a late 2016 GS 300h F-Sport, after driving an IS 300h for more than a year. 

Its fuel consumption for the first 300+ km has been 8.8l/km, with AC on, mostly non-urban. 

This is a far cry from my 6.8 in the IS. 

I've looked at the stats on the main screen for previous runs and they were averaging the same values, lowest was 5.5, highest 8.9.

The car has sat for a bit (1-2 months, maybe more, I don't know). 

Can I expect this to come down to normal values? Any ideas what the cause might be?

It runs into hybrid mode just about fine, and it has passed the hybrid Battery test this week... 

Thank you! 

[ColinBarber]

Was your IS an F Sport? They consume more fuel because of large wheels and aero drag.

What tyres are on the vehicle, they might be less efficient ones than standard. 

After a drive, put your hands near each wheel to detect any excessive heat that would indicate a brake not releasing correctly. 

[In_a_state]

The IS has largecF-sport-like wheels, but anyway the consumption is way too high for a 300h motor. 

Brake wear is normal, I will give it a Dr Prius scan. 

Would the trips graph show only similar consumption trips or somewhat of an average? If it's an average it would mean the car has always had high consumption which is crazy. 

[In_a_state]

I will clean the hybrid cooling filter. 

Is there a procedure for resetting the hybrid system? It doesn't go into hybrid mode when it should, does Toyota have such a procedure or can an owner do anything like that? 

[In_a_state]

After cleaning the Battery cooling filters, the system is working properly and staying well below the 120F DrPrius is reporting as the threshold. 

However, I'm still getting  0.5-1l/km above my IS fuel consumption, could the extra weight (I asume about 100kg) and bigger wheels (19 vs 18) lead to such an increase? 

[Notamech]

On 6/20/2024 at 12:56 PM, In_a_state said:

After cleaning the battery cooling filters, the system is working properly and staying well below the 120F DrPrius is reporting as the threshold. 

However, I'm still getting  0.5-1l/km above my IS fuel consumption, could the extra weight (I asume about 100kg) and bigger wheels (19 vs 18) lead to such an increase? 

I suspect that is exactly it. The GS is heavier than the IS hence it is tuned slightly differently because of the weight difference. Also better kit levels and a larger screen all probably consume some more energy overall.

[In_a_state]

It seems breaks are also not in good order and I need to replace caliper brackets+the glinding bolt so pads aren't sticking to the rotors. 

Will report the consumption once that is done.