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I just plopped a B15Z1 (VX) lean burn engine in my car, so it'll be a while before I would consider converting it to an EV. I've thought about it and researched numerous times, but have to travel too great of distances for an EV to work, especially in the winter when driving up into the NC mountains. The EV conversion will probably wait until either gas goes up to $8/gal, I purchase another car for my daily driver (whenever they finally come out with one that gets better highway mileage than the aerocivic), or I retire and don't have to travel those distances any more.
The lean burn Aerocivic was made possible thanks to Greasemonkee for engine components, garage space, and many hours of labor spent in doing the swap, Tom-O for engine parts, flydude 1221 for engine components, and Vtec-e for the ECU. So far it is running fine and I am learning how to incorporate lean burn into my driving routine. It takes about 10 secs for lean burn to come back online following a FAS and so far I have had it up to 75mph on a flat road without it dropping out of lean burn (I'll need to find a flat road witha higher speed limit to find its maximum lean burn speed). This morning I got 68mpg on the route where I normally get 63mpg (assuming the SuperMID doesn't need any recalibration for the new engine). I'm sure this mileage will improve as I learn the characteristics of the new engine.
I was driving my dad's 2004 Prius during the time that my car was down doing the swap and driving the same routes and routines I normally do in the aerocivic. It averaged 62mpg (compared to the 72mpg I normally get with the aerocivic this time of year). While the Prius coasted better than most cars, it was nowhere near a match for the aerocivic in coasting ability and had more wind noise. At low speeds around town it could beat the aerocivic's mileage, but on the highway it was not even close (it would be interesting to see how much a complete aeromod makeover would improve the highway mileage).
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