are you an employe getting a w-2 or self-employed?
as an employee none of your vehicle expenses are deductible for federal purposes but some states may allow a deduction.
as self-employed - schedule C
yes you can use different method for the two vehicles with one caveat
if you used actual expenses for the first vehicle you cannot switch it to the standard milage method.
There are other complications if used in a business such as a partnership, S or C-corp where you own the vehicle rather than the business.
