No, but it gives you something to look at more than Btu production.
Sleeping out in that Quinzee with the candle burning , I felt like it helped but again maybe its so your mind eases more than heat.
Moe, with your talents and bush skills, you'd have no problem starting a fire beside the car big enough for someone to see and for you, if stranded, to gain some warmth from. The advantage of the candle is if your not stuck near a stand of Birch or Cedars... even live wood will burn if you can get the fire hot enough.
If anything the smoke from it would definitely be like setting up a flare.