Fuel Consumption

Mar 25th, 2004, 17:29

I just bought a S80 2.4SE (170bhp) Auto on a 2000 (X) plate and am extremely happy with it except for one thing: it drinks petrol! It seems the average mpg is 19 for town driving (at an avg speed of 20 mph), whilst on the motorway it seems fine. Its had a recent service at 92k (on 94k now), so what could be the problem?

The things that I know to check:

1. air/fuel filter
2. spark plugs/leads etv
3. switch petrol - Shell Optimax or BP Ultimate
4. change/clean injectors. Any recommendation of where to buy new ones if this is the case? I've tried putting in additive that is supposed to clean the injectors - no noticeable difference yet.

Is there anything else I can check?

Cheers

Ali

Mar 25th, 2004, 19:28

Your consumption figures are about right. I don't think you have anything to worry about.

JOHN 850 · Mar 25th, 2004, 23:27

Nothing like mine then ! 28-30 around town/mixed driving with 30-35 on a run. W reg 140 bhp manual with a 135k on the clock !

Cheers,

John.

Mar 27th, 2004, 05:39

Things that I have done so far are to inflate the tyres to 36psi (they were at 29 psi), and filled up using optimax. So far have done 20 miles mixed (half and half most likely) and the average mpg reading is at 34.7 which I'm more than happy with.

I'll post the final mpg in a week or so. Got a feeling its gonna beat the 19mpg I was getting!

Cheers

Ali

Mar 28th, 2004, 13:18

Ali,
Re your average MPG, have you any idea how accurate your computer is?

Also, has the ride quality suffered with the higher tyre pressure?

Colin.

Mar 28th, 2004, 23:10

I've no idea how accurate it is, but its reading an avg mpg of 27 now (190 miles done). I guess I'll only find out once the tank runs dry and I do a manual calculation as to the accuracy of the computer.

The ride quality is still the same with the increased tyre pressure. I just followed the recommendations on the fuel flap for 17" alloys which are on my Volvo.

Cheers

Ali

JOHN 850 · Apr 13th, 2004, 11:26

Just thought I'd up date you on my best mpg to date ;

38.2 mpg on a 140 mile run !!!

Not bad for a big petrol car !!

Cheers,

John.

Mar 25th, 2004, 17:29	#1
Vulture Guest Location:	Fuel Consumption I just bought a S80 2.4SE (170bhp) Auto on a 2000 (X) plate and am extremely happy with it except for one thing: it drinks petrol! It seems the average mpg is 19 for town driving (at an avg speed of 20 mph), whilst on the motorway it seems fine. Its had a recent service at 92k (on 94k now), so what could be the problem? The things that I know to check: 1. air/fuel filter 2. spark plugs/leads etv 3. switch petrol - Shell Optimax or BP Ultimate 4. change/clean injectors. Any recommendation of where to buy new ones if this is the case? I've tried putting in additive that is supposed to clean the injectors - no noticeable difference yet. Is there anything else I can check? Cheers Ali

Mar 25th, 2004, 19:28	#2
Iank Guest Location:	RE: Fuel Consumption Your consumption figures are about right. I don't think you have anything to worry about.

Mar 25th, 2004, 23:27	#3
JOHN 850 Senior Member Last Online: May 26th, 2024 21:48 Join Date: Dec 2001 Location: North Yorkshire	RE: Fuel Consumption Nothing like mine then ! 28-30 around town/mixed driving with 30-35 on a run. W reg 140 bhp manual with a 135k on the clock ! Cheers, John. __________________ Current : 2020 XC60 R Design, 1998 C70 T5 Coupe, 1988 360GLT, 1999 C70 TDI Previous : V90 RD, 360GLEi, V70TDI, V70 2.5D, 965, C70 T5 x3, 340 x2, 360GLT x4, P1800ES x3, 240 x3, 940 x2, S70 x3, 850 x3, S80, 480 x2, 120 x2, XC90 x2, V70 D5 x3

Mar 27th, 2004, 05:39	#4
Vulture Guest Location:	RE: Fuel Consumption Things that I have done so far are to inflate the tyres to 36psi (they were at 29 psi), and filled up using optimax. So far have done 20 miles mixed (half and half most likely) and the average mpg reading is at 34.7 which I'm more than happy with. I'll post the final mpg in a week or so. Got a feeling its gonna beat the 19mpg I was getting! Cheers Ali

Mar 28th, 2004, 13:18	#5
Montgoc Guest Location:	RE: Fuel Consumption Ali, Re your average MPG, have you any idea how accurate your computer is? Also, has the ride quality suffered with the higher tyre pressure? Colin.

Mar 28th, 2004, 23:10	#6
Vulture Guest Location:	RE: Fuel Consumption I've no idea how accurate it is, but its reading an avg mpg of 27 now (190 miles done). I guess I'll only find out once the tank runs dry and I do a manual calculation as to the accuracy of the computer. The ride quality is still the same with the increased tyre pressure. I just followed the recommendations on the fuel flap for 17" alloys which are on my Volvo. Cheers Ali

Apr 13th, 2004, 11:26	#7
JOHN 850 Senior Member Last Online: May 26th, 2024 21:48 Join Date: Dec 2001 Location: North Yorkshire	RE: Fuel Consumption Just thought I'd up date you on my best mpg to date ; 38.2 mpg on a 140 mile run !!! Not bad for a big petrol car !! Cheers, John. __________________ Current : 2020 XC60 R Design, 1998 C70 T5 Coupe, 1988 360GLT, 1999 C70 TDI Previous : V90 RD, 360GLEi, V70TDI, V70 2.5D, 965, C70 T5 x3, 340 x2, 360GLT x4, P1800ES x3, 240 x3, 940 x2, S70 x3, 850 x3, S80, 480 x2, 120 x2, XC90 x2, V70 D5 x3

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