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I have a 1999 WH statesmen V6 ecotec and the fuel useage is high considering that the statesmen/caprice models are heavy. I would like to get better fuel ecomony and improve the auto tune shift points/line pressure up abit to make the car more enjoyable t
Posted by MACE Support on 30 April 2018 12:54 PM
A memcal upgrade help. Another option to consider to improve fuel economy would be a plenum spacer. For further information about these items please refer to the links below. Plenum Spacer http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectID=1469462

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