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Welcome to the site.
Sounds like you drive something with a big engine. You can probably accelerate from a stop in 2nd gear. What you are trying to do is use more throttle and less brakes. Look up brake specific fuel consumption (BSFC) for a good lesson on engine efficiency. If you can pass without downshifting that is the way to go.
Be sure to check out the 100+ hypermiling tips (link at the top of the page) too.
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