Heck, even just the Jeep daily driving makes pretty good sense. Average American drives 15,000 miles per year.
15,000 miles at 15mpg and $2 a gallon is $2,000
15,000 miles at 30mpg and $2 a gallon is $1,000
Extra car means additional insurance, registration, maintenance, and repairs.
Set of tires lasts 3 years, $360. Or $120 a year
Insurance probably $50 a month. Or $600 a year
Registration probably $60 a year
Repairs and maintenance probably $300 a year
Add those costs plus the fuel and you're at $2,080 a year. More than what the Jeep costs to daily drive.