Mazda5 Maintenance and Fuel Economy Question

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'13 Mazda 5 Sport
I’m about to replace the rear struts on my 2013 M5 Sport. I’m wondering if I could reuse the OEM bellows & boot? I’m working on an extremely tight budget and bought budget struts.

I’m also wondering what’s the best way to get good gas mileage? Running it in semi auto, certain rpm to stay under, aerodynamics, etc…
 
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