For those in hot climate areas where Nissan's willing to buy back their cars, it'd be interesting to see what people are to replace their Leaf. Perhaps they should post in the "Defectors" thread (http://www.mynissanleaf.com/viewtopic.php?f=27&t=9903
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I heard one who turned theirs in got some VW TDI. FWIW, I wouldn't buy a VW nor one of their TDIs (due to VW's generally spotty reliability and more recent HPFP problems). And "clean diesels" are pretty dirty in terms of EPA pollution score vs. PZEV certified cars. Diesels also produce more CO2 per unit of fuel burned than gasoline (http://www.eia.gov/tools/faqs/faq.cfm?id=307&t=11
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To me, good candidates might be a Prius, Camry Hybrid, Fusion Hybrid ('13 FFH gets an amazing for its size and power 47/47/47 mpg EPA rating) or PHEVs/EVs w/active thermal management (e.g. Volt, FFE (?), Tesla Model S (long wait for that), etc.)
That said, if one were to buy say a Prius in a hot climate, I wouldn't be surprised if one needs a replacement HV battery not long after the 8 year/100K mile HV battery warranty expires as we on Priuschat have tended to see a correlation between HV battery failure and high temps and/or hilly commutes. CA and CARB states get a 10 year/150K mile HV battery warranty.