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Weight vs HP is another variable to consider to make some incremental gains in economy. A doughnut instead of a full size spare is one small change (keep a full size @ home) remove extra stuff from trunk. I like to swear by using synthetic oils whereas they provide less friction than some conventional oils for every application possible. I tend to slow down on hills and coast more on downhills and approaching stops. I also have an auto eng. stop when i come to a stop and it auto starts when I release the brake pedal. This saves fuel when in city traffic.
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