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Right, but the curiosity is in fleet average, or typical figures.
The reason I'm curious is people have the idea that it's the weight of vehicles that causes poor fuel economy, and it doesn't seem like much of a factor to me. That got me wondering what percent of fuel is spent accelerating/braking compared to rolling and aero drag taking into consideration that some people drive very heavy vehicles almost exclusively in stop and go traffic, and others might drive small cars almost exclusively on the freeway, and everything in between.
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