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Max Verstappen has aimed at dig at Ferrari after their Team Principal Mattia Binotto voiced budget cap concerns over Red Bull upgrading their car. The two F1 giants are locked in a

fascinating title battle already this season, with Mercedes languishing much further behind. Just six points separate the two teams in the Constructors' Championship. Ferrari's 

Charles Leclerc is also leading the Drivers' Championship ahead of Verstappen, with the reigning F1 champion trailing by just 19 points. After the recent Miami Grand Prix, which saw

Verstappen finish first and Leclerc second, Binotto questioned the number of upgrades Red Bull have made. And Verstappen has hit back at Binotto, stating Red Bull are simply "more

efficient" than their rivals. In an interview with _Sky Sports_, Verstappen was asked about Ferrari's surprise at the amount of upgrades Red Bull have made given the budget cap.

"It's not a surprise to us," he replied. "Maybe we are more efficient." JUST IN: F1 OFFERED NEW GP VENUE BY NEW YORK MAYOR AS ECCLESTONE PLAN REVIVED "We do not

have the money to spend for upgrades at each single race. I think it is as simple as that. "Not because of an inability, but because of the budget cap. So we need somehow to try to

focus development on when we believe it's the right moment, and the right spending."