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I recently broke 50mpg at 70 in my Acura TSX swapped Insight on a longer trip. It's hard to know if there wasn't some external factor like a tail wind. MPG at that speed seems pretty variable, I've seen as low as 46, but road conditions in winter are highly variable. I'm willing to bet 50+ in summer will be normal. Could probably break 60+ with P&G.
My other (stock) Insight easily maintains 65-70mpg in winter at 70mph.
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