Your car would probably benefit more than most from aero mods. A lower grill block would be a good place to start with your car, and is a $5-10, 1-3 hour DIY job. In Scotland, you could probably run a full lower grill block on your car during the winter, and at least a partial lower grill block in the summer. I wouldn't recommend doing this without a scangauge or something to monitor coolant temps accurately.
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