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How do I improve gas mileage on a 2006 Chevy express cutaway van. (15 ft box on truck) does not have the box that goes over the cab and is

just a cube. it has a gas powered 6 liter that gets a whopping 10 mpg empty or full. any chips or special plugs or anything that could help? I was told by the dealer when I bought it that it should get 14-16 on highway. was it just a bold faced lie or is there a fix here?

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They didn't give me anything in writing. It was 1 year old, do no sticker. The mileage was verbal. But very nice to know. Thanx
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It probably doesnt apply to you, but its nice to know someone sued and won. Maybe eventually they will all think twice before they lie about the kind of mileage a vehicle gets before a customer buys it. Hopefully you figure out a way to get better mileage and none of this will apply to you.
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Yes and thanx again
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