I use a Mini Van, but when needed, I was able to get my kit into our Focus wagon
(16x26, one up, 2 down, snare case, hardware not in the case). I didn't use the hardcases, but bags would fine for this vehicle.
I have a Kia Soul now, and it's seats fold all the way down totally flat which is really nice.
It gets pretty nice mileage (30+ city), and would have enough room for a (normal) kit and hardware. A hardware bag could fit under the folded down back seats.
I haven't tried, but I could probably get at least what I got in the Focus in the Kia.
Good luck!