The new all-aluminum engine has a twin-scroll turbocharger, and the turbo in the 286hp variant is a ball-bearing one. In both cases, the cylinder head is one piece with the exhaust manifold, a first for JLR. The manufacturer notes that this method shortens the engine's warm-up time, improving efficiency and reducing emissions. There is also a new direct injection system with centrally mounted injectors; inlet valves are electro-hydraulically controlled with variable valve lift. Between the two engine variants, estimated fuel economy is near-identical with both Discovery Sport versions reaching 25 mpg highway and 21/20 city; the Evoque manages 29 mpg in highway driving no matter which engine is specified, but in city driving the lesser engine reaches 22 mpg, the 286 hp engine 21. The drop-top Evoque is only available with the 237 horsepower engine.