Gasly was able to move up the order after showing fine pace early on in the race, despite being the only driver to start the race on the hardest compound tyre.
Gasly defended until his only pitstop on lap 26, before charging back through the field on medium compound tyres to eventually finish in eighth position, dedicating the drive to his late friend Anthoine Hubert, who was killed at the circuit in an accident in F2 last year.
Speaking on the performance of his driver, Tost explained how both drivers initially had a good start off the line and made up positions, but Gasly's efforts saw him drop down the order and come back to finish ahead of his teammate, Daniil Kvyat, who took the chequered flag in eleventh.
“Both of our drivers had a really good start and Pierre immediately began to overtake the cars in front, moving up to P8," Tost commented.
“After (Antonio) Giovinazzi’s crash which brought out the Safety Car, we decided to leave Pierre out on the hard tyre as for our strategy it was too early to pit him.
“Pierre did a very good job defending his position until other drivers managed to overtake him on fresher tyres, so we pitted him for mediums on lap 26.
“It was a fantastic drive from Pierre and without the Safety Car, our strategy to start on the hard tyres would have paid off even more as I think Pierre could have finished higher up the order.”
Bahrain International Circuit - Winter testing