Without knowing exactly how many miles you’ll actually be driving, tough to pick between the two. The good news is I‘m Sure you can change your mind and take the other option later on.
As for the actual driving, I don’t think I’d be all that concerned. I drive 25,000 miles per year on average and don’t get reimbursed anything. Been doing it for over ten years now.
Pick a reliable vehicle - if it’s your Mazda, then good, go with that - and drive it. You’ll go through tires quicker, brakes, and fluid changes, BUT if it’s mostly highway miles? Out of pocket repairs might not be that much. Hopefully your insurance covers glass, because you will go through windshields. Highway mileage is great but it’s a bear on your front end (paint, glass). Keep your alignments up to date if you can, it might save on tires. Watch your tire pressures. Keep the vehicle clean, inside and out. Get yourself on a rust prevention regimen (if you live in the salt belt). Buy good snow tires (if you’ll see winters/ice/snow). Change your fluids when you’re supposed to, and rotate those tires every 7,000 miles. Have plenty of windshield washer fluid on hand. Keep a set of jumper cables in your car, maybe a milk crate with some basic fluids stored in it and a good flashlight. And keep your AAA membership up to date, just in case. Fingers crossed, I’ve never broken down in the 250,000 miles I’ve driven in the last ten years.
I’ve been lucky (knock on wood) with my commuting, but I have run into a few “experiences”.
A turkey ran across the highway one morning and tried to jump over my hood. I was going 75 mph, it never made it past my passenger side mirror.
Turkey number 2 — tried to make it across a side road, it successfully made it into the right side of my bumper instead.
I’ve almost hit a few deer (thank god I’ve missed them). Turkey’s are one thing, deers are another.
I’ve had several older Toyota Camry’s and Dodge Caravans try to end my life, luckily I have good brakes. But I’ll tell you what. If you’re ever next to a 1999-2005 Camry or Caravan on the highway? Move at least a lane away.


I’m really not kidding.
Pickup trucks are now dominating the highways, get ready to have headlights right into your rear view mirror. And expect to look down at your speedometer (as you’re going 75) and there will be an F-150 or Chevy grill an inch away from your rear bumper.

But I actually like driving, some day I wouldn’t mind finding a job that payed me to do it. Maybe when I retire.