Simple question, if you were to buy a plane, (certified or home built, doesn't matter) that had a cruising speed of at least 130 KTS, IFR, 2-4 seats with room for luggage, what would it be and why??
low fuel burn rates and low maintenance costs are a big plus.
As usual, "It depends."
I don't think of the 182 as an "econobox" but considering there is a cost to the buying and selling process, and the 182 can do damn near anything you want it to and you won't need to buy another bird, that's economical, right?

However, if you want the ability to carry a lot of stuff, or carry four real-world adults *in comfort* (y'know, so they'll want to go again), well, the 13gph really isn't THAT much. Plus, it's a tough bird. And did I mention it'll do pretty much anything? The versatility is awesome. But again, I don't consider it an "econobox" otherwise.
My three favorite "econobox" airplanes are the DA40, the Mooney M20J/201, and the Comanche.
The DA40 will cost more to acquire than the others, but the insurance rates are very good due to the fixed gear and a truly excellent safety record, and the DA40 squeezes more knots out of a gallon of fuel than any other certified, fixed-gear airplane: The XL/XLS models will get 150-155 KTAS on 10 gph. They'll cost you around $200K though. A slightly earlier model (2004+) will get 140-145KTAS on that 10gph, still incredible for a fixed-gear plane. The DA40 is delightful to fly - It's sporty but honest, the view is the best of any 4-place airplane, and you can get your friends in the door easily thanks to 3 of the 4 seats having direct exterior access (canopy for the front two seats, door for one of the back seats.)
The Mooney M20J/201 will have lower acquisition costs, similar fuel costs for a slightly higher (155-160 KTAS) speed, and higher insurance/maintenance costs due to the retractable gear. It's also not a good airplane for wider people, but is great for tall, skinnier folks. Also probably not something you want to put real people in the back of. But, it's sporty, fun, and fast.
The Comanche 180 will have the lowest acquisition cost and will do around 135 KTAS on 10 gph. The Comanche 250 will burn more fuel, but will go faster and carry more stuff. The advantage of a Comanche 180 over something like an Arrow is that if you decide you want the extra performance, it's possible to upgrade the engine to the 250, there is no other difference between the airframes. The Comanches have a nice wide comfortable cabin, there are still mods and parts available, and they make one of the best overall economical purchase choices.
Hope this helps.
