In the last month or so I’ve noticed a serious decrease in the mileage I’m getting from a tank of gas. Like almost 100 km less.
In addition, my heater will only produce heat when I’m travelling at higher speeds.
I can’t defog my interior windows without using the air con...but I think this might be normal?
2002 gas L400 135,000 km. I’ve had it for almost 2 years direct import from Japan with 74,000 km.
I was using regular gas for most of the time, but started using supreme when I first started experiencing the decrease in mileage.
I do plan on taking it into CCA in the new year but was wondering if there’s anything that comes to mind when I describe what’s happening.
Would be interested in hearing your thoughts.

TIA