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Ah, I see. Forgot you're driving a 91 Metro.
Hmmm, I suppose you can roll the dice and build the removable velcro (or magnet) screen but to minimize risk of a ticket, use it for the passenger front side for your dad. At higher speeds, that screen is more opaque to air movement but there is still heat transfer so it will keep the interior cooler. If it wasn't for that legal snippet I'd do this too (shading alone to me would be worth it). Otherwise you can go with a portable cooling device and not worry about the windows (fans, A/C, ice)
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My 5 pillars of fuel efficiency:- driving style
- aerodynamics
- tires
- weight reduction
- engine maintenance
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