Daily driver in Canada for 4K that has to be sports car & get 20+mpg on the highway. If the 4K includes what you can invest into mods then I can't think of something that would fit the bill. The fact you'll be cruising in snow during the winter puts a damper on getting a mustang 5.0 (which would be close to your quest).
Perhaps a used prelude might just squeeze into your requirements.
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