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Old 07-20-2009, 02:16 AM   #29 (permalink)
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Originally Posted by bwilson4web View Post
Any vehicle that requires the engine to run at 30 mph, diesels, gas, or hybrids with little or no electric vehicle mode, will pay about 50% of their tank just turning over the engine. In contrast, a hybrid with significant electric vehicle mode gets a much improved efficiency, nearly double that of the other.
I don't think that's strictly true. It mostly depends on engine displacement/gearing. Generally speaking most engines in the states are oversized compared to power requirements at 30mph, but for the world as a whole this isn't the case as much given the prevalence of 1L-1.5L engines along w/ suitable gearing that can allow vehicles w/ smaller engines to idle along in fifth/sixth at ~30mph in the ~300g/kWh region of the engine's BSFC map.
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