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Recent Maintenance

By looking at the practice times for our next race we have some on SS 4 seconds faster than 1 other on SS, and 5 secs faster than myself on medium, so i assume this has something to do with the most recent maintenance and if it most likely is then will this impact on those that have already done their practice runs before the maintenance?? 

Yea i found that a little later on thanks Jose. Was wondering in case it had an effect on the practice values for the guys who had already run their laps, fuel and tire wear on a much different compound, 4 seconds was a big change.