Alain Prost is frustrated that F1 fans still "don't really care about" the technology that has gone into today's V6 engines.
Fans have been vocal in their criticism of the 1.6-litre V6 engines ever since they made their debut at the start of last season.
However, Prost feels it goes deeper than that.
According to the four-time World Champion, fans do not even care about the chassis or even the speed of the cars. Rather they just want to see great battles at the front of the field.
It is, he says, a different market to those embracing the new Formula E series.
"In F1, it's a bit different and what is happening is a bit frustrating," the Frenchman told Motorsport.com.
"We have an engine whose technology is incredibly advanced, but people have not bought into it. Maybe people expect something very different from F1.
"At the end of the day, they don't really care about the chassis, or about outright pace. They want battles on track, because they want it to be interesting; it's a real Drivers' Championship.
"Formula 1 remains a bit distant, and you're always a bit far away from F1. Yet, this two-year-old engine which is as powerful but consumes 30% to 40% less fuel, you feel like the fans don't really care about that.
"You also need to understand it according to the series, according to the approach, according to the customer base – and they're real fans, rather 40 to 60 years old.
"But we in [Formula E] are aiming at another category, notably for younger people. You shouldn't have the same marketing positioning on both, that’s obvious."