What's not quite as obvious is how much more power that little v8 has at the lower range of the RPM band where most driving is done. It doesn't look like it's a lot more powerful just seeing peak, but it's far more powerful at 2k rpms when you're cruising on the highway.
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It absolutely is and I get it. My point was that Toyota got their V6 above where it needed to be competitive to the market in 2010 with HP numbers higher than the previous V8, so they just wrote off the V8 and called it a day. Hell, in 2010 Jeeps 3.8l and 3.7l had 205-210 severely underpowered HP and were unreliable trash. Jeep had the 4.7L still for 2010, but those numbers were similar to our previous V8 and separated their awful V6s from the Hemi. That would mean Toyota would have needed to put in the 5.7L in the 4R to compete there with those HP numbers. At 270HP the 4R looked very promising for a V6 SUV, so that was the only option they decided to give as it was right in the middle range of it's class at the time. I'm sure emissions and mpg regs helped with Toyota's decision to drop the V8 too. Maybe they wanted to keep the GX more separate from the 4R and not pull sales from the Lexus. I don't know. Could totally be wrong for the reasons, but that's my thought on it.
The difference later is that other companies upped their games with newer transmissions to help with the mpg and advance the power game where as Toyota did not. The 5th gen got a refresh in 2014 just like the Jeep GC, but they got powertrain improvements and we didn't even though Toyota I'm sure could have.
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