Recently, I rented a Chevy Sonic 4 door sedan. I had to drive it quite a lot (work trip). And I liked it a lot. I drove it fast on the freeways, keeping up with all the fastest traffic. I used cruise control heavily.
I found that I could manually switch to 6th gear at 35/36 mph. It was easy to keep well under 2000 rpms. At 75mph, it only turned about 2600 rpms. The A/C seemed very efficient. I was able to cool the cabin in 100 degree sunny conditions with inly parttime use, with the cabin air recirculation setting going.
The coolest thing was the discovery that in cruise, using the manual gear selecting setting, the car would stay in 6th even under heavy load on the freeways. So, climbing a steep hill at 65mph, for example, the car would stay in cruise, stay in 6th gear, and slow down under the set speed, only to regain that lost speed without my intervention once the car got back to more level ground. Nice little go box!
Some pictures
And here is the final, total, combined city/highway fuel economy. It was mostly freeway driving, but I was driving with the fastest traffic. No turtle here. Only the hare.
Nice car.