.

Even this stripped-to-the-bone, one-off MX5 Superlight roadster concept, built for the 2009 Frankfurt motor show, weighed in at almost exactly a ton.

If rumours leaking from Toyo Kogyo's top-secret skunk works are anything to go by, the next Mazda MX5 could just be the lightest yet.

A senior insider let slip that the slide rule sensei have been challenged to slice nearly 330kg off the 1127kg of the current MX5, to bring it down to a target weight of just 800kg.

The idea…