First Year’s Tracking of Hybrid Garage use.

So, it’s been over a year since I’ve started tracking my garage’s EV vs ICE use. As I previously wrote a year ago on my Minimizing Gas Use article, I do drive a hybrid garage. For those that need a refresher, a hybrid garage is one where some of my cars are EVs and the others are internal combustion engine (ICE) cars. As a member of the rEVolution, why do I still have ICE cars, it’s because I’m not as good as those that have gone to an all electric lifestyle. Hats off to them, but there are just times that I like to use my vehicles that happen to use gasoline.

This past “winter” was not indicative of what we usually use our thirteen year old BMW X5 for, but when it snows, it’s fun to go up to the mountains around LA and play in the snow.  The X5 lets us do that when there are restrictions to get up the mountain when the snow is fresh.  Additionally, when we need to buy large items to move, we’ll use this same workhorse to help us move them.  Granted the Model S does have a LOT of space, but I’m not one of those brave souls to carry “cargo” in them.

Prior to adding the Roadster to the garage, we kept the 328i Convertible for those days that we wanted to drive around with the top down.  We still have it and waiting for the start of summer to sell the vehicle when we expect to have the best demand for them.  (Send me a note around May if you’re interested in buying our 2008 328i Convertible).  Granted the BMW Convertible is a lot easier to take the top down and up on than the Roadster, this will probably be the next ICE to be sold from our garage.

That being said, I understand the costs of my addiction to oil and gas and try to minimize it.

So, about a year ago, I started tracking the number of miles my household used ICE vs. EV to see what percentage of our private car travels are electric and what part are powered by internal combustion engines.  Since we travel a little bit, I’ve decided to count the miles driven in rental cars to this spreadsheet and the miles that we’ve lent our ICE vehicles (and EV) to our friends and family when they visit Southern California.   This is why I created some tracking spreadsheets and tracked mileage for a year.   However, the results were stupefying.  After 365 days of meticulously tracking the mileage consumed by my household for EV vs. ICE for the year, the old 80/20 rule asserted itself with up to two decimal points of the percentages.

We drove a total of 80.05% of the time and ICE 19.95% of the time.  Granted, this sample for the past year included three EVs from November 2013 to March 2014 as well as several long-term (a week or greater) visits from family and friends who we lent our vehicles to.  Furthermore, a majority of this past year’s sample was with the Active E as the only EV in the garage, and as a result we were only constrained by the 80-100 miles of range per charge.  With the Model S and Roadster, our range is at least double that (if not more) as we have ample access to really fast recharge rates with the Model S.

It is interesting to note that the majority of more EV mile percentages for the months occurred in the latter part of the year, when we had taken delivery of our two Teslas.  More importantly where both my wife and I had both driven predominantly EVs for our daily drive.  Whereas in the earlier part of the year, we only had the Active E and one of the ICE vehicles ended up being the other car driven.  As a whole, the household (as defined earlier) drove about 42,000 total miles.

Since, I’m an EV Geek.  I’m wondering what the next year will bring since we’ve given up our Active E and are both driving Teslas that give us at least 170 miles of range on a full charge.  I would hasten to guess that the percentage of EV use vs. ICE use should dramatically increase, but another year will let us know.  In the meantime, bask in the mediocrity of the past year.  [80/20, what a let-down.  Or should I really just celebrate verifying one of those rubrics that we’ve been taught since youth.]

[UPDATE 2014-06-15]Well, I guess I was NOT using my spreadsheet properly, I actually did not have an 80/20 first year, it was closer to 81/19… (or exactly 81.20% vs. 18.80%) It would seem that I forgot to calculate in the LAST month, fixed the calculations and it’s now correct.

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Dennis

rEVolutionary armed with a Tesla Model S S85 and a Tesla Roadster, when his wife let's him borrow it. Formerly driving a BMW Active E (2012-Feb to 2014-Feb). Dennis has been driving EVs since he found himself on the BMW Active E trials on February 2012. As a result of his involvement in the Active E program, he became Accidentally Environmental. Aside from this blog, he often tweets @dennis_p. When not driving, he can be found on the following Tesla/EV forums - teslamotorsclub.com, teslamotors.com, and model3ownersclub.com as AEdennis or on speakev.com as Dennis. In the interest of full disclosure, Dennis has an inherent bias toward electric vehicles and has an investment in and is LONG Tesla (NASDAQ: TSLA).

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