What type of getting to work trips are business expenses as opposed to commuting?

How does the car expense deduction differ if the car is used 50% or less for business purposes?

When can the standard mileage rate be used to compute car business expenses ?

How can a sole proprietor benefit from expensing car usage ? How can do this practically ?

Base information can be found in Ch . 49 but will be necessary to use outside resources (so only use outside reaources)