Most four-cylinder engines were mostly used in basic economy and small vehicles with hopes of keeping family sedans at a lower-cost but according to specialists, more luxurious and upscale models are now being manufactured with the four-cylinder engines of the small cars of the past.

Recent SUV tests have demonstrated that, in order to offer drivers better gas mileage and luxury, automakers have decided to equip their luxury SUVs and sedans with four-cylinder engines. The turbochargers in these vehicles produce better power but are also able to offer the fuel-efficiency of a compact vehicle.

Some of the vehicles that belong to this new group are the BMW X3 and the Audi Q5. Experts say that the new turbocharged engines are more refined and reliable than previously.

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