The value of product increments being delivered is estimable, and once estimated (whether as ROI, cost of delay, or some other measure), its value can be prioritized. In Scrum, this is known as working from a prioritized product backlog. Agile can be used to create high quality products.
No wonder then that the C-Class, one of the most affordable Mercedes models, is the best-selling luxury car in America. A range of turbocharged 4-cylinder, 6-cylinder, and 8-cylinder engines are available; the latter are reserved for the AMG performance-tuned versions of the car.
Several other luxury models are in the 28-mpg range, like the $34,900 BMW 328i. Beware: They use premium gas, which costs more. There's also luxury hybrids, such as the Lexus CT 200h, a small car that gets 42 mpg and starts at $29,120; and the larger Lincoln MKZ, which gets 39 mpg and starts at $34,755.