OK, whether it is five turns or ten turns originally, we should be cutting that down by a sixth from the 20% speed boost with Gearhead.
Then she is trying to get the truck to go faster, one action each turn, I'll put up 8 rolls just to be sure (reactions 8, pilot 6, +1 from Vehicle Empathy):
https://orokos.com/roll/1008550#which is
8#15d6t5: 8 # 8 [15d6t5=1, 6, 1, 5, 1, 4, 5, 6, 3, 5, 5, 3, 5, 6, 4] 7 [15d6t5=6, 2, 3, 6, 5, 6, 2, 3, 3, 5, 6, 2, 6, 2, 4] 3 [15d6t5=1, 5, 3, 1, 3, 1, 1, 1, 1, 4, 1, 2, 6, 2, 6] 5 [15d6t5=5, 1, 3, 5, 2, 6, 1, 4, 6, 3, 2, 5, 1, 3, 2] 3 [15d6t5=5, 2, 6, 4, 2, 4, 3, 2, 6, 2, 2, 3, 1, 4, 4] 5 [15d6t5=5, 4, 5, 1, 3, 2, 5, 1, 2, 2, 2, 6, 3, 3, 6] 5 [15d6t5=5, 4, 1, 5, 3, 2, 3, 2, 3, 6, 6, 6, 2, 4, 2] 7 [15d6t5=4, 5, 1, 2, 5, 1, 5, 6, 6, 1, 6, 1, 3, 4, 6]
8
7
3
5 (7 ones! not a glitch, but I was getting worried while counting)
3
5
5
7
At the last moment that she thinks she can handle it she'll go for a drifting stop (like in the movies, where the truck ends up perpendicular to its original direction of travel). This is a stunt to decelerate faster than braking could normally manage. I'm not sure if this is a speed limit or a handling limit? (my guess would be handling, but you could argue that things dealing with high speeds would have a handling limit, I'm fine either way). Truck has base 5 handling (both on and off road) and 4 speed, but both have been upgraded by one (so 6 and 5), and vehicle empathy adds one more to the handling limit (so handling 7, speed 5). But then again, let's just pre-edge to get rid of the limit and add more successes, because I've not had an opportunity for Tam to really do anything fun with driving yet!
Doing this move on a motorbike would have a difficulty of 3, doing it in a pick-up truck will certainly be bumped up into the "extreme" category with threshold of "4+". Exactly how high is up to Thanee. (also if there are additional modifiers for trying not to hit the 'bears')
Finally, while Gearhead is active she also has +2 dice for difficult stunts, pushing her pool to 17 dice, +4 for pre-edge =21.
Drifting sideways stop in a Gopher:
21d6h5 8 That should do it, so when we reach that point either I'll IC the stop or someone else can describe it rather than waiting on me.