All the comments saying that you can get more car for the money miss the point. It is very tough to get a more fuel efficient, better built, more reliable and more comfortable car for $20k.
That is what Yaris owners are thinking. I own an '05 Echo and my last tank in warm weather on mostly very light traffic secondary 80km roads was 5.0 L/100km on the nose....
Hey John, you're a good and honest writer - glad to hear comments from an owner, or at least the Echo (same thing but older). Your driving scenario is basically optimized for your car, probably one of the reasons you chose it. 80-90 km/h, backroads, not a lot of traffic. We had a Yaris for a 1-week stint and drove the Barrie-Toronto commute along the highway 400 corridor. The engine was spastically overstrung, revving at or above 4,000 RPM to keep pace with traffic. Not only was it assaulting my ears to the point where I could barely hear the radio at half-volume, it achieved mileage that would have been marginally better than a much larger, more powerful engine. We averaged about 9-10L/100 KM through that week, which is about 1 L/100Km less than what my wife currently gets (strictly highway) in her Santa Fe with a 3.5L V6. I would imagine a Mazda3 with 2.0 would achieve similar or better highway mileage, and be much more pleasurable to ride in, all while delivering livable economy for the times you're not barraging the fast lane. And again I'll mention the bad roads - with such a small wheelbase and tight, space-optimized suspension, road imperfections come through like a mallot.
I think my main beef is that the RS costs so much. In base-model trim, you're right, you can't get much better. But at this price point, you can get into a compact car, which is better in almost every respect. I'm glad to hear your car is working out well for you, again it sounds like you have the perfect drive and lifestyle needs for this type of vehicle, which is why we can celebrate the diversity of the auto industry. Perhaps my Mazda Protege5 is a silly car for some people, but it works for me. But for $21K, the Yaris RS may be good for some but disappointing for many more.