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Originally Posted by Double-Trinity
This tends to produce a relatively slow acceleration, as my car has a very small engine. However, in the case of the 450h, with an engine producing about three times as much horsepower, at the same RPM/throttle position, the larger engine should produce much more power, and thus a relatively fast acceleration at its most efficient output.
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I believe your conclusions about power/efficiency is incorrect. For the larger V6 and V8 ICEs, the sweet spot for maximum power efficiency is typically obtained at the higher speeds (50+
mph). Your Honda is probably a V4, and the power band should peak at lower RPMs. At lower speeds, the larger V6/V8 ICE engines are traditionally poorer in both acceleration and fuel efficiency. That's what's great about hybrids. The electric power compensates where the ICEs are weak, at the lower speeds to provide a big win for overall power and acceleration.
I also found this PDF off of the Lexus website:
http://www.lexus.com/assets/models/p...ance_guide.pdf
On page 8, they list the Top 10 tips for improving fuel economy for the GS 450h:
Their #2 tip is: Accelerate slowly.
Interesting enough, the #1 tip is: Plan ahead to combine short trips in order to minimize cold starts.