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Rather than worrying about how many mpg's a particular engine supposedly does work out how many miles you are likely to drive in a year which doesn't sound many if you are concerned about "clogging" it up. Not getting engines properly warmed up and sitting outside your house looking pretty but going nowhere for weeks on end does not do a car any good regardless what size engine is fitted.
My advice would be get the biggest engine you can with your budget and smile every time you drive it!
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