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Cd 0.117
Pushing the mpg from 32.2,to 42 mpg is a 30.43% increase.
To do that all with aerodynamic drag reduction would require cutting the Cd by 60.86%,down to Cd 0.117.
It's not impossible,but not 'practical' unless you finished my trailer for me and pulled it around behind all the time on the open road.
You'd most likely need to remove the entire roof and greenhouse and begin fresh,a daunting task.
If you will go to GOOGLE IMAGES and search for the MG EX 181and GM Sunraycer,these will give you an idea of what Cd 0.117 would look like.
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