After a tumultuous partnership was ended with McLaren at the end of 2018, Honda switched to Red Bull for last season, enjoying a stunning improvement in performance and reliability.
It resulted in Verstappen claiming three wins and six additional podiums that helped propel him to third in the drivers' championship behind Mercedes duo Lewis Hamilton and Valtteri Bottas.
Following the RB16's bulletproof reliability over the first pre-season test at Barcelona's Circuit de Catalunya, with Verstappen clocking up 254 laps across his day and a half in the car, he said: "They (Honda) are pushing flat out.
"Of course, you always want improvements. Improvements definitely have been made compared to last year as well.
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