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engine out of tune/needs repair how you drive low air pressure in tires parking brake left ON many things can do it

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Using too "thick" an oil. Many people disregard factory specifications thinking that "thin" oils will damage their engine. It's amazing how many people use 20W-50 oil year-round because "it's what they've always used". My Toyota Soarer can use 5W-20 oil but this is not commonly available (and is horrendously expensive) so I use 5W-30, which is recommended for all engine types in the Toyota. Despite this, some owners insist on using 15W-60 or similar.

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Q: What are some causes of poor fuel economy?
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