Vauxhall has added a diesel engine to the Tigra line-up due on sale next year.

Using the same 1.3-litre 70PS CDTi turbo diesel engine used in the Corsa supermini, the Tigra will become the most economical roadster in Britain when it goes on sale in January. Returning 48.7mpg on the combined cycle and 72.4mpg in the official government extra-urban test, the average motorist covering 12,000 miles a year could save around £450 annually by choosing the Tigra CDTi rather than some of its petrol-engined rivals.

With CO2 emissions of just 124g/km, the Tigra CDTi falls into the lowest possible tax band for conventionally-engined vehicles, at just 15 per cent – even under the new stricter bandings being introduced for the 2005-2006 tax year.

Tigra Brand Manager, Sara Nicholson said: “Rising petrol prices, company car taxes and concerns about the environment mean that buyers are looking for the most fuel-efficient cars possible, but they don’t want to give up style or performance.”

“With a CDTi Tigra, Vauxhall has created a real head-turner which is actually one of the most economical cars in Britain. The average driver could save enough in fuel and tax costs every year to top up their tan on a holiday. That should make sure it isn’t just the Tigra which turns heads! “

Prices have yet to be announced, but it is expected that the Tigra CDTi will cost around £14,500 when it goes on sale in January.