[RedDevil]

This morning I had another run with the hot water bottle in the intake. On top of that I wound a hot wet towel around the intake and over the airbox.

Weather was about the same again, I had a good run with only one short stop, and this time I had parked facing the street making a clean exit.
The intake temp shot up to 22°C (from 13°C) almost instantly.

The IMA system decided it was time to do a forced recharge of the battery, I had difficulty keeping the revs low. The engine temp shot up.
Just before it reached the point where the blue light would go out the IMA system decided it had done enough; those last few degrees took quite some time and distance.
I could have easily made it past school with the blue light on if the IMA system had not spoiled it.

I got an economy bonus on the highway, as the usual recharge there was not needed today.
All in all I had good economy going to work; 3.6 l/100 km, which is on par with my current tank average. Not bad for a morning commute against a head wind.
Better than yesterday (without the bottle) when there was less wind.

I'll keep doing this on and off the coming days, see if the trend persists.