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With the 6.2/6.5s, it's all in the precups. The smaller precups used on the earlier, non turbo 6.2s were the ones for the mpg. The larger 6.5 turbo precups were great for power, but the mpg dropped.
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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