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A niche car, like the Fiat 500, doesn't have a lot of candidates for simple and straightforward comparisons. You can stretch to compare it to a car that's a little bigger or more expensive, or you can look at it next to some cars you'd usually skip, such as the Fiat's stable mate, the 500C.

The 2013 Acura RDX is a bit of an anomaly. While most automakers are switching to smaller, turbocharged engines to achieve higher EPA numbers and entice buyers (as well as meet new government-mandated CAFE requirements), Acura has chosen instead to drop the RDX's turbocharged four-cylinder in favor of a normally aspirated V-6. The crossover still manages to improve upon its previous fuel economy figures, although the increase is fairly small: the all-wheel-drive model sees the most significant increase with a combined rating of 22 mpg, up from 19 mpg. This might not sound like a particularly good number for a small crossover but when compared to others in its class, it stacks up pretty well: six-cylinder all-wheel-drive versions of the Audi Q5, BMW X3, and Cadillac SRX achieve 20, 21, and 18 mpg, respectively.