80mpg from diesel-powered first-gen Insight

Yes, you read that correctly. AutoBlogGreen has released news that a company called Red Light Racing has installed Volkswagen's 1.2 litre, 3-cylinder Pumpe Düse TDI in a first-generation Honda Insight and the net result is 80mpg in US gallons - a staggering 96mpg imperial.

The engine has been taken from Volkswagen's Lupo 3L, a model that was only available in mainland Europe and itself made 94mpg imperial, equivalent to 3 litres/100km. The Lupo however was solely diesel-powered - and Red Light Racing state that they haven't even hooked up the Insight's hybrid motor to the diesel unit yet and once they do there could be another 15-20% improvement.

The Lupo 3L was highly modified from the standard Lupo TDI - like the Insight, it used aluminium in much of its construction, and also in common with the Insight it used low rolling-resistance tyres and a stop-start function to save fuel when stopped in traffic. The engine produces 61bhp and makes 140Nm of torque, which is 9bhp less than the Insight's 1.0 litre petrol IMA unit but a useful 27Nm more torque. Coincidentally, both Lupo 3L and Insight weigh in the region of 850kg, so the engine seems ideal for use in the Insight, though according to Red Light Racing the installation naturally wasn't too straightforward.

Diesel clatter aside, the new engine should provide very pleasant driving characteristics too. The final quote goes to Red Light Racing, clearly a company after Tarmac's heart: "The main idea was to take existing hardware, hack it, and make a vehicle that could be produced by major manufacturers or individuals that would deliver tremendous fuel economy without a tremendous leap in technology. I believe we succeeded."

(Image credits: AutoBlogGreen and Wikipedia)