Quote:
Originally Posted by 99metro
but but but you claimed "MPG" on this thread title. I was mislead. I like the eMPG designation for those of you don't actually USE gasoline and are calculating the conversion.
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The fact that we're in the "Fossil Fuel Free" forum might have been a hint it wasn't a thread about gasoline
TomEV: I've noticed the same thing. The farther I go on a charge, the higher my efficiency. It makes sense for a few reasons:
1) Just as with and ICE vehicle, rolling & mechanical resistance decreases somewhat as the tires/bearings/transaxle fluids (if you've got one) warm up, and they'll warm more on a longer trip.
2) But the biggest difference I think has to do with the charger, and measuring energy use at the wall plug. From the point of view of the charger, the most energy efficient charging stage is the bulk phase; the least is the finishing phase (battery resistance rises with voltage, if I recall). If you do short trips and spend proportionately more charging time in the finishing phase, efficiency will apparently decline.
If we could measure energy efficiency of just the vehicle (e.g. from the pack), I'm sure we'd find the swings are much smaller on short vs. long distances traveled compared to readings at the wall.