for your reference, the seats take 18w on low, 35w on high and the steering wheel is less than that, couldn't find someones measurement data but i would guess 10-15w. This will not make a measurable effect on your range if you had them on the whole trip. The heat pump varies as far as how much power it takes, depends on the temperature you are keeping in the cabin.
If you said it was wet/foggy and you had the AC on and the heat on also, then that is a double whammy. The AC will use the heat pump in 'dehumidifier' mode and it won't add any heat to the cabin. While doing that, your heater is all off the resistance element, and will take several KW of power. Mind the climate control power gauge if your telematics has that option (gen 1 SV/SL models can show that).
outside temps below 40 affect my gen 1 leaf's range noticeably also, so i can attest to the performance hit you saw there.
wipers and radio also use practically no power. if you do this trip in the summer you will succeed with much more range remaining. you will just have to adjust your driving habits in cold and inclement weather.
did you reset your 'miles per kwh' gauge before starting the trip? Some quick envelope math - you had 9% remaining, the first gen Leafs have about 89% of the capacity usable when new based on previous peoples data/math. assuming the 40kwh has similar numbers then you had 35.6 kwh to burn (100%) when you set off, you had 9% (3.2 kwh) remaining when you got home so you used up 32.4 kwh - puts you right around 3 miles per kwh, pretty darn low.. maybe the 40kwh has more 'reserves'. Plug in leafspy and see how many GIDs are available at 100% charge.
read this interesting thread to learn more about capacity: http://www.mynissanleaf.com/viewtopic.php?t=16197
my 2 cents