You can use this to help with fuel cost comparisons -
https://www.fueleconomy.gov/feg/Find...tion=sbsSelect
I think you are questioning getting another vehicle to save money? I would be surprised if this works out.
In the original calculation I don't see insurance and registration figured in.
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2006 Z4M Coupe - Stromung exhaust, ZHP knob, stubby antenna, clutch delay delete