your millage is tied to your tune up. What were the injector settings before they installed the jakes. Go back to that setting and see if your millage returnes. You may also have an injector that is dribbling fuel into the cylinder when it is in the no fuel position ( foot off the go pedal ) coming to a stop or down hill operation with the jakes on.
Hope this helps
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I gave up health foods... at my age I need all the preservatives I can get.
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