While Mercedes still lead the engine arms race, it has been revealed the manufacturer used more of its engine development tokens to do so. A FIA press release today revealed where all four manufacturers stand in regards to token usage for their engines in 2015. Introduced with F1's new engine regulations for the 2014 season, manufacturers have 66 'tokens' they can use to develop their power unit within the FIA's designated timeline. According to that timeline, manufacturers were designated a maximum 32 tokens for 2015. Of the three manufacturers who participated in 2014, world champions Mercedes have used the most, spending 25 of their 32 tokens already. In comparison, Ferrari and Renault have used 22 and 20 tokens respectively. Honda, being a year late into the sport, does not have the same 32 token limit, and while originally this meant they had to cease 2015 development by the end of February, the Japanese company has successfully negotiated with the FIA to be given 9 tokens for 2015, based on the average of those available to the other manufacturers. Each component of the engine costs a certain number of tokens (maximum of three) with a designated developmental freeze date. Therefore, there is no guarantee Mercedes’ rivals can catch up, as they may be deficient in too many areas, or unable to improve a desired component any longer. However, it certainly provides an opportunity. 2015 Engine Tokens Remaining By Manufacturer Ferrari 10 tokens Honda 9 tokens Mercedes 7 tokens Renault 12 tokens Does their token advantage give Mercedes' rivals a chance to catch up? Sound off in the comments below.