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The shadow generally holds 10-15 inches of vac at cruise, depending. 18 seems really good. My engines do 18-20 at idle. Of course, every engine varies, especially ones that are 20 years old and turbocharged.
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'05 Outback XT, 19 mpg
BP-turbo 93 Festiva (long gone)
1/4 mile - 12.50@111.5
Best MPG - 36.8
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