Your property taxes and mortgage interest are deductible as a 2nd home.
IRS only allows deductions for the costs you are asking about (mileage, repairs, etc) if the property is income producing property - a rental.
Then you have to charge rent at Fair Market Value and then expenses that are ordinary and necessary to produce the income on the rental are deductible.
If you do make major improvements on this, keep track of them, however, as if does become a rental in the future these additional costs will increase the cost (or basis) of the house.