22 mpg, fuel smell

I return around 20mpg running 32" mud tyres 
So your 29s will possibly give the mpg you have 

Thanks for the thoughts everyone, I’ve looked at the MAP sensor on live data but I don’t really know if the numbers are right or not, it definitely is in pretty solid vacuum when you’d expect it to be and goes to almost atmosphere pressure at full throttle…

IAT looks reasonable given ambient temps, throttle position sensor reads from 15% at idle to 80% at full throttle, is this ok? 

but yeah I guess computer thinks it’s running lean when it isn’t, I guess the only culprits at this point are MAP sensor or O2 being a bit tired? Despite the values looking somewhat reasonable 

Presumably unplugging the MAP as a test will make it run pretty rough as it will have barely any data to go off?

Thanks; I’ll check the fuel pipe too. It absolutely could be a small leak evaporating, I leak in the return wouldn’t affect how it ran either hey

Unplugging the MAP sensor will be fine for a short drive, as would unplugging the IAT, I doubt your car will run rough.

To be honest you can pour over all of the data and it might look right, but if one of the sensors was giving the wrong reading you would never know.

I am not sure there is an easy way to tell if the O2 sensor is faulty apart from swapping it out and Facade’s comments about cleaning all of the electrical connections is a good idea.

I did have one further thought, you could try clearing the ECU map and let it re-learn the correct settings. May be if it had a problem and a sensor was changed the ECU is full of garbage.

I think all you need to do is disconnect the battery for 15 minutes and the ECU goes make to defaults.

Robin

I thought I had a problem with a MAF sensor on my other non-Jimny car, I disconnected the MAF, the car ran fine, so I first cleaned t and also ordered a new one. Unfortunately it didn’t fix the problem (a misfire at low revs), the problem turned out to be a low battery, but I went through plugs, coils, air filer O2 sensors, all of which were old or worn out.