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You may be increasing the throttle percentage by gearing it taller, but be aware that the engine will also turning more slowly, so the pistons will wear against the sides of the cylinders fewer times. Overall, taller gearing improves economy and lengthens the life of the engine.
Regarding the Bluetooth dongle, the range is only a few feet, and it doesn't work when the van is off. Plus, most of the data from the computer is read -only, so the dongle came make any changes. The vehicles that were highjacked also had cellphone connections to the internet, which your van definitely does not.
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