Normal fuel consumption in my silver Forester has been a little better than the green one. Around 620kms on a tankful (dead full to bone dry).
Two weeks ago I had to go down a road which was very twisty and climbed over lots of big hills. Naturally this inspired some spirited driving, but I was pretty mortified when I ran the tank dry at only 438kms.
Three drums of fuel later (one @20 litres, one @ 21 litres and one unknown, but estimated @ 14 litres) I was dry at 465kms - without the twisty road and hills.
So I know I have a problem. I am thinking it might be an Oxygen sensor, the airflow meter or something else which has input into the computer to change settings. If the second figure, 465kms, on regular running with approximately totalling the regular tankful - maybe less a litre or at most two - is my new 'norm', then I have a jump in fuel consumption of approximately 30%, though there seems to be no change in anything else.
Except that the exhaust smells pretty rich...
Any advice is very welcome.
Two weeks ago I had to go down a road which was very twisty and climbed over lots of big hills. Naturally this inspired some spirited driving, but I was pretty mortified when I ran the tank dry at only 438kms.
Three drums of fuel later (one @20 litres, one @ 21 litres and one unknown, but estimated @ 14 litres) I was dry at 465kms - without the twisty road and hills.
So I know I have a problem. I am thinking it might be an Oxygen sensor, the airflow meter or something else which has input into the computer to change settings. If the second figure, 465kms, on regular running with approximately totalling the regular tankful - maybe less a litre or at most two - is my new 'norm', then I have a jump in fuel consumption of approximately 30%, though there seems to be no change in anything else.
Except that the exhaust smells pretty rich...
Any advice is very welcome.