As of September 2019, the R series engines were only offered outside of Japan. It also uses the same computer ( engine control unit) controlled distributorless coil-on-plug ignition as the Honda K-series engines. The automatic transmission model is rated at California Air Resources Board (CARB) ULEV-2 (Ultra Low Emissions Vehicle) with fuel economy 25 mpg ‑US (9.4 L/100 km 30 mpg ‑imp) city, and 36 mpg ‑US (6.5 L/100 km 43 mpg ‑imp) highway. The engine also features piston cooling jets, previously available only on high performance engines, and in the ninth-generation 1.8L Civic (2012-2015) the pistons are treated with molybdenum disulfide applied in a polka-dot pattern. Piston rings are given an ion plating and weight is reduced with plastic and aluminum parts and variable length intake manifolds that maintain ram air at a wide RPM range. The engine uses many advanced technologies to improve fuel economy and reduce friction. The R series engine has a compression ratio of 10.5:1, features a " drive by wire" throttle system which is computer controlled to reduce pumping losses and create a smooth torque curve. It is fuel injected, has an aluminum-alloy cylinder block and cylinder head, is a SOHC 16-valve design (four valves per cylinder) and utilizes Honda's i-VTEC system. The Honda R engine is an inline-four engine launched in 2006 for the Honda Civic (non-Si).
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