Edmunds.com predicts the 4Runner will skip it's mid-generation refresh and instead be redesigned (6th generation???) for the 2015 model year (Mid 2014 calendar year). This prediction seems plausible, because starting with the 2017 model year the tougher EPA fuel economy standards begin phasing in for all automakers. Perhaps, a hybrid powertrain or downsized engine with DI and turbocharging will be offered in the next generation to meet the tougher EPA fuel economy standards that will be in effect in the near future.
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In contrast, the KaizenFactor blog did a detailed analysis and predicts a mid-life refresh for the 5th generation 4Runner for the 2014 model year (2013 calendar year).
The 2013 Toyota, Lexus and Scion “launch list” gets tweaked yet again! | Kaizen Factor
KaizenFactor also has a good article about future Toyota engine tech which mentioned a Toyota/Denso fuel injection breakthrough for diesel engines called i-Art (intelligent-Accuracy Refinement Technology). According to the article, it's "the world’s first autonomous closed-loop diesel fuel injection control system. In essence, this system equips each injector with a pressure sensor that communicates its fuel pressure to the engine ECU and, in doing so, significantly reduces exhaust emissions and increases fuel efficiency, compared with the conventional open-looped technology that does not have feedback function from the injectors."
TMC’s Environmental Technology Development update: a peek at Toyota and Lexus’ powertrain future (Part 1) | Kaizen Factor
http://www.globaldenso.com/en/event...pressinformation/files/diesel_development.pdf