Relatively low gas prices has turned the less fuel-efficient crossovers, SUVs and trucks into the really big sellers in the current auto market. Economical compacts and subcompacts have to compete harder for their share of the market, so they have to be great rather than good to turn a buyer’s head. Among this class of top-performing compacts, the Used 2017 Chevrolet Cruze is easily one of the best with great looks, fuel economy, practicality and driving dynamics.