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Chevy Sonic (Aveo in Europe-Asia/Barina in Australia) 1.4 Turbo. Toughly built and very conservatively tuned (from the point of view of durability and quietness) stock engine. Appears to benefit in stock configuration from 93 octane fuel. Performance (and apparently MPG-enhancing) modifications sold by the manufacturer without invalidating warranty. Large community of performance modifiers. MPG appears to benefit from several of these mods. Turbo/manifold integration results in quick engine warmups, potentially improving winter MPG by the standards of small gasoline-only cars. GM global car means there are a lot of them on the road. The smallest of GM's gasoline-powered lineup in the USA that's comfortable for highway cruising; and frankly has better highway manners than its import competition as well, so it's the kind of car that would appeal to someone who'd normally buy something less economical. Turbo power train means more mpg variability than normal based on the skill and thoughtfulness of the driver. Affordable parts and relatively easy to work on.
I rest my case.
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