I'll be disappointed if I can't average over 30mpg
I had my ODB tool attached to the car on my drive into work this morning to see if I could spot anything.
Whilst sat in traffic at idle I had a look at the O2 sensors.
The two pre-cat sensors are both switching from 0.1V to 0.6/0.7V.
They're switching a bit slower than I would expect, maybe about once every 2 seconds - is that normal for an Alfa, or should they be quicker than that?
The post-cat sensor doesn't do an awful lot and seems to sit between 0.4 and 0.5V for the most part.
My long term fuel trims are +5% on bank1 and +6% on bank2, which doesn't seem ludicrous.
Idle speed is ~850 RPM when warm.
I got a couple of snapshots of the MAF reading at different RPMs, do these seem normal?
850 rpm - 2.75g/s
3045 rpm - 20.25g/s
5622 rpm - 37.25g/s
The temp gauge in the dash gets up to about 90 degrees within a few minutes, dips briefly (presumably as the thermostat opens), then creeps back up to just below 90 degrees and stays there, steady as a rock.
Interestingly, the temperature reported by the scan tool takes much longer to get up to 90 degrees, and was reading 10 degrees lower than the dash gauge for the first 20 minutes or so of my journey. It eventually caught up with the gauge and agreed with it though!
Does the 147 have 2 temp sensors, one for the ECU, and one for the cluster by any chance? or is the gauge in the dash frigged a little bit?