The correlation between weight and efficiency is true below 45 mph in
general. Above 45 mph aerodynamics starts being more important than weight.
This is why the the heavy first generation Toyota prius has good highway
MPG. In general the stop and go nature of travel below 45 mph overwhelms
the greater efficiency.
We used a hill between my house and shop to work on the aerodynamics of my
car. After playing with cardboard and tape (then later vinyl) we increased
the coast downhill speed by 15 mph and decreased my 1/8 mile time by 2/10
with the same trap speed. After this my 2000 pound Daytona-look-a-like went
from around 350 wh/mile to 312 wh/mile driving 15 miles with 6 stop lights 4
stop signs and a large hill and no-regeneration in both directions. This
was testing done for X-prize competition and was well measured.
-----Original Message-----
From: tomw via EV
Sent: Monday, May 18, 2015 10:09 AM
To: ev@lists.evdl.org
Subject: Re: [EVDL] EVLN: Open Source Street-Legal affordable long-range
EV4the masses
The numbers you post for Tesla do not include charger losses, the 216
Wh/mile
does. The 196 Wh/mile number should be compared. Either way 216 or 196 is
far less energy/mile than a Tesla S uses, so more efficient at moving one
human around, which is the typical occupancy.
Maybe you are considering efficiency as energy/mile-weight. Then the Tesla
would be 325/4750 lb = 0.068 to 375/4750 = 0.079 and my car would be
196/2260 = 0.087, so the Tesla moves a unit weight more efficiently than my
car assuming those numbers represent the same 50% mix of highway and city
driving.
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