The growing push towards smaller and more fuel-efficient vehicles could possibly lead the charge for changing consumer perceptions of what defines a luxury car, according to Nissan’s global design director Shiro Nakamura. When asked about a possible flagship sedan for Infiniti, Nakamura replied that while the company is working to establish itself as a ‘Tier 1′ luxury brand, it is still “not sure a big sedan is necessary for a luxury brand,” and that in the coming decade “luxury may be defined by technology, quality and design.”

Infiniti has not had a large flagship sedan since 2006, when the Infiniti Q45 filled this role. Previous rumors had the Q45 being revived, but they were subsequently squashed. Talks have most recently turned to an Infiniti-branded four-door version of the Nissan GT-R, which would certainly add some serious performance credibility to the lineup. On the other hand, it’s hardly small enough to be a lightweight and fuel-efficient vehicle, nor is it likely to be built large enough to afford flagship-sedan interior space.

While the next-generation Q45’s future remains unclear, there is greater hope for an entry-level Infiniti that would be smaller than the G37. Previously we reported that Nissan execs had hinted that the mechanicals from the upcoming 350Z successor could be borrowed by Infiniti to create a small coupe, although the Infiniti version would likely have a smaller engine compared to the 370Z.

Despite an entry-level model still being over three years from production, Nakamura said tentatively that any new Infiniti models should be RWD in keeping with the premium image of a Tier 1 luxury brand.