View Single Post
Old 10-22-2008, 11:14 PM   #3 (permalink)
Ptero
Hydrogen Nut
 
Ptero's Avatar
 
Join Date: Oct 2008
Location: California
Posts: 151

Smart Car ForTwo Pure - '08 Smart Fortwo Pure stripped
90 day: 51.35 mpg (US)

BMW 750iL V12 - '90 BMW V12
90 day: 26.4 mpg (US)

Wildfire 250C - '08 Shandong Pioneer 250C
Thanks: 2
Thanked 33 Times in 22 Posts

With the All Electric Aptera, it is very easy to figure out the mileage range. The mileage is determined by the distance you can drive, under normal circumstances, until the batteries are effectively drained. In the case of the first Aptera typ-1e, we have calculated the range to be about 120miles.

With the Plug-in Electric Hybrid version of the Aptera(typ-1h) the mileage of the vehicle is difficult to describe with one number. For example, the Typ-1h can drive 40 to 60 miles on electric power alone. Perhaps for such a trip, the engine may only be duty-cycled for a few seconds or minutes. This would produce a fantastic number, an incredible number that, though factually true, would have no useful context, i.e. it's just a point on a graph.

An asymptotic decaying exponential is an accurate way to describe the fuel mileage of the Typ-1h. For example driving say, 50 miles, one might calculate a MPG number that's 2 or 3 times higher, say, 1000 MPG. As battery energy is depleted, the frequency of the engine duty cycle is increased. More fuel is used at 75 miles, the MPG might be closer to 400 MPG. Again, we're using battery energy mostly, but turning the engine on more and more. Just over 100 miles we're just over 300 MPG, and just beyond 120 miles, we're around 300 MPG.

So why pick a number at 120 miles? Well, it's more than double of most available plug-in hybrid ranges that achieve over 100 MPG. It's three times the distance of the typical American daily commute. It's a meaningful distance that represents the driving needs of 99% of Americans on a daily basis. Sure, it's asymptotic, after 350-400 miles it eventually plummets to around 130 MPG at highway speeds where it will stay all day until you plug it back in and charge it up.
http://http://www.aptera.com/details.php

I'll be climbing into my typ-1h and driving it out of the Aptera factory in California straight to Chicago.
__________________
Ptero
  Reply With Quote