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an addendum to this post. we have a gas-guzzling 7.5L '91 f350 that we use for our work truck and hauling the camper. it averaged 8 mpg. back in the early summer i installed the same vacuum gauge that i put in my car and have since been averaging 10 mpg. that's only 2 mpg but it's a mileage increase of 25%.
i love vacuum gauges!
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