No, even ignoring the likely increase in drag, the amount of power generated by a couple ~16" diameter fans at 60mph would be miniscule. You could probably measure it in low single digits of wh/mi.
Take for instance your common 16" oscillating desk fan:
Stay cool with the 45-watt Brentwood Kool Zone F-16DW 3-Speed 16 in. Oscillating Desk Fan. It features direct airflow with wide oscillation and pivoting head and a convenient built-in handle. This stylish
www.homedepot.com
That particular fan takes 45 watts. This means that if its on high for a solid hour straight, it'll take 45 watt hours of power to run. Conversely, if you had it being turned by the air, you might get as much as 45wh out of it in that HOUR (Yes, I'm ignoring that the AC motor is probably total crap at producing power, but you can at least get an idea of the scale) That's a maximum output of 0.75 wh per minute, if we assume that everything is 100% efficient and the speed of the air through the ducted passageways is at least that of this fan sitting on a desk being plugged into a wall. You might even get double or triple that if the fan and ducting was designed well. So, lets assume quadruple.... 3wh/mile per fan. Lets put two fans in there, now its 6 wh/mi at 60mph. Hardly a game changer for a car consuming 254 wh/min.
On the flipside, now we need to carry the weight of the fans/generators, probably the weight of the duct-blocking assembly(since a fan designed for 60mph will probably downright explode at 145mph), the monstrous horribly inefficient DC-DC adapter getting 30 volts up to 400 volts, and you've lost every bit of frunk space... for MAYBE 2% more range.