Lexus IS300 Hybrid

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Lexus have launched their 3rd generation hybrid synergy drive in the form of the new IS 300 Hybrid. Available in 5 options, lexus have added 75mm to the overall length of the IS saloon and taken the usual painstaking approach to redesigning it from top to bottom, Lexus has developed an all-new hybrid powertrain for the IS saloon, which mates a 2.5-litre four-cylinder 178bhp Atkinson cycle petrol engine with a 141bhp electric motor, both feeding the rear wheels.

The IS300h’s petrol engine, like all of Toyota and Lexus’ hybrid motors, runs on the Atkinson combustion cycle for a high expansion ratio and increased efficiency. Fitted with a new fuel-injection system with injectors positioned both in the chamber and in the port, it also has exhaust gas recirculation for reduced operating temperature and high thermal efficiency.

There are low-friction piston rings fitted, as well as a low-friction timing chain, low-friction valvegear, and an intelligent oil pump, giving a smoother and quieter running engine. It runs at a very high compression ratio of 13.0:1. Meanwhile, power for the 141bhp, 221lb ft, rear-mounted electric motor comes from a 230-volt, 192-cell Nickel-Metal-Hydride battery pack.

It’s satisfying to find the IS300h free of many of the compromises we’ve seen in hybrid saloons before. In entry-level SE trim, it’s hardly any more expensive than a mid-spec 2.0-litre diesel Audi A4. Economy comes in at 99g/km of CO2 and 65.7mpg(4.3l/100km) on the combined cycle.

The IS’s interior will not dissapoint you either. The 85mm of additional legroom has greatly improved the passenger compartment into a fairly roomy one. The look and feel of the dash layout is an improvement on previous models with a robust feel to the controls.