Take the weight of the bike as a percentage of your gross car weight, and consider that 4% more weight might reduce mileage by 1% There are spread sheets for your exact situation, if you want precision, if the gains are not obvious from a quick estimate.
My finest commute was with a car pool to go 20 miles. I'd coast down a hill to the car, take off the front wheel to fit it in the trunk, ride out of the city, and then ride a few miles of lanes and trails to my job site.
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