"It was a frustrating afternoon in many ways, we finished where we started and never really had much opportunity to do any more," explained Trackside Engineering Director, Andrew Shovlin.
"Our HyperSoft stints were weak on both cars, we suffered graining early on and fell back so stopped Lewis quite early for UltraSoft to avoid losing race time. Valtteri had a similar issue but we kept him out a bit longer as it wasn't really impacting his race.
"Our Championship rivals were better at managing the HyperSoft today and we need to understand and improve before Montreal as it's likely to be even trickier there. With Valtteri we decided to try the SuperSoft tyre as Lewis was feeling that the ultra was quite delicate and needed managing.
"This seemed to work well in terms of pace, with Valtteri catching the cars ahead quite quickly but there was no way to pass so he had a rather frustrating afternoon following Kimi for 46 laps.
"Lewis was concerned that he wouldn't get his tyres to the end as they opened up early on but after some degradation they stabilised and he was able to keep pace with Vettel who seemed to have similar issues and Riccardo who was struggling with a power unit problem.
"Towards the end of the race, the midfield cars closed up which took away any real options to do anything under a Safety Car, so we just focused on bringing the cars home.
"Whilst Montreal should suit our car more, the tyres will play a big role in the strategy there and unlikely Monaco, you can overtake. So, we'll be working hard over the next few days to make sure we understand our weaknesses."