I do a lot of gliding as well. There’s no need for me to give it gas while I’m going down a big hill. I’ll take the fuel savings if I can because I drive a lot.
My maintenance routine is pretty much this...
Oil every 5,000 miles, rotate the tires, check the brakes, suspension, axles, check for leaks. Look everything over. You’ll be surprised what you unfortunately might find (mice nests, torn axle boots, bad ball joint, whatever).
Coolant factory fill. 100,000 miles. Every 50,000 thereafter.
Transmission pan drop and filter between the first 50,000-75,000. Then simple drain and fills every 25,000 thereafter.
Plugs every 100,000 miles
One or two undercarriage rust prevention treatments every year. Usually Fluid Film, with a little touch up here and there at oil changes.
Air filter once a year. (25,000-30,000 miles for me)
Wiper blades twice a year. All fluids bought at Walmart, same for the blades and filters.
And that’s ^^^ it.