wow, you have some crappy tires or have your tire pressure way too low or have an alignment issue or you are just driving in the cold and haven't seen the joy of driving in the summer yet.bitflung wrote:the absolute best mi/kWh rating i've gotten over a 10+ mile trip, even driving <20mph on backroads, was 5.2mi/kWh. i can just about hit 5.0mi/kWh if i drive carefully even up to ~30mph, but i have to annoy the folks behind me as i slowly stagger away from stops or cruise to the next stop without using my brakes.
in my experience there doesn't seem to be any gain for driving less than ~20mph and nearly zero difference between 20 and 30mph. above 30 and i do see an immediate drop in mi/kWh. i haven't tracked how the lower end of the ratings scale at speed though since i so rarely drive on highways (and when i do i'm generally on a trip that is more important to me than tracking these things for future reference).
I get over 5 m/kwh doing 40. If I did less than 30 for any long trip I'd expect more like 6 or 7 miles per kwh.
Seriously at 12 mph on level ground with no AC/heat you should be seeing something like 8 or more miles per kwh.
keep in mind you have to use leafspy on a long repeatable test, the instrumentation on the dash will be very inaccurate for miles per kWh when regen is in play.
Try a flat track at 70F and see if you can't hit 10 miles per kWh if you have a couple of hours to kill and a flat track to use.
If you can't you need to check your alignment, and assuming it is OK, up the air pressure in your tires or buy tires with lower rolling resistance.