I see lots of people tossing out long trips as an issue, some dismissing it as infrequent. Individual's of course vary but long trips are a real issue for the average American.
If you want to focus on reducing oil, or are mixing the desire for a new car with reducing costs and oil dependency then the BEV +ICE compared to an Range Extended EV REEV) +ICE take looking at real data. Your personal data is best and it is clearly very family dependent. But if one wants to talk main stream or average, that has been discussed on another thread (http://www.mynissanleaf.com/viewtopic.p ... &start=210
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where there is some data to address "average" American, look at http://www.bts.gov/publications/highlig
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The data is a mess but there are some useful tidbits you can get
The average American in that data takes 24 "long trips" trips per year, with a median distance of 194 miles. (Long trips are defined as the final destination > 50miles from home, so minimum 100m round trip).
So its not 1-2 times per year that the need 200 miles or more.. it is on average 12 times in the 200-2000 range and 12 times in the 100-200 range, with a total travel for long distance trips of about 7500 miles.
Which is better BEV+ICE vs REEV in terms of reducing gas usage depends on the the average of BEV+ICE verses a REEV. Since I don't know of the efficiency of any 3rd party range extender I cannot estimate it. But I will comment that some have posted here that a range-extender build into car is not efficient, without any data to support that view. If its a choice between buying a BEV to augment an existing average ICE, or buying an integrated EREV like the Volt (which gets 37mile per charge and 40mpg/hwy), then for the average data (commute <35 miles & ~24 long trips per year) BEV +32MPG ICE uses more gas than an EREV. Sure a family can do better; a BEV + Prius is better; A BEV + TDi is better. But if the choice is Buy a BEV and keep an average ICE, versus but a integrated EREV, the EREV may save more gas overall. YMMV and anyone considering the issue should model their projected usage.
What about the economics of an add on RE?
With a 25mpg ICE the 12 trips > 194 miles need about ~100 gallons of gas, which is < $400/year and it will be hard to justify an expensive range-extender. (Total long distance travel 7500 is about 300 gallons or < $1200 a year).
60% of families have second car, so the car is not and added cost, just gas. A rental ICE would obviously add more.
With respect to the total cost of covering one can argue if renting an ICE or a Range Extender makes more sense.
Renting a range extender might make sense if its efficient enough and the price < price of gas for the ICE. With a limited market for while that may be difficult to make cost effective.
If you are focused on minimizing cost this is totally moot as no new BEV or Range Extended EV (REEV) is the right choice. The right choice is used Prius or other high MPG car (because of the vehicle cost and rapid depreciation no new vehicle is a good financial investment), at least until used BEV or REEV are on the market and a decent price.