Some improvements
Unique corner and overtaking challenges for each track.
Car upgrade system with levels rather than just innovation/no innovation
More Play Games achievements (make them register first)
Fuel consumption rate should change linearly rather when altering aggression instead of being the same for e.g. 65% to 100% and then suddenly dropping at 64%.

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Achievements have been added to version 1.2.4 (out now for Android, coming soon for iOS).
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Ahh - now I understand - that's a good idea.
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Anonymous commented
For example:
If you put aggression from 65% to 100% it will say the fuel will last you 19 laps. However, when you decrease the aggression to 64%, suddenly it will say that the fuel will last you 23 laps. I'm suggesting that perhaps each percentage of aggression should worsen fuel consumption by an amount.
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I'm not sure what you mean by the fuel consumption comment - can you elaborate?