My condolences on your 7:30 a.m. flight.
If I had that flight, I'd leave 3 hours before takeoff. At 4:30, I could allow a 45-minute drive and still leave some room in case of traffic, which would be rather odd at that hour on a Sunday morning. But that'd get me at the airport at 5:15-5:30, which would allow me time to drop off the car, check my bags and eat some breakfast before boarding at 7:00 a.m.