What settings are you using? Every time I've used the miata or a slow car I get punted by the other car into the pits so I guess I don't travel enough miles and get no credits
I tried it this afternoon with an SLS GR.3 I won and it's working so far but not nearly as many credits. I'm only doing this for a second account so I can do all the offline races and challenges again. I haven't really driven sport mode much lately after I found out I was a good bit faster and much more consistent using all of the driver aids...... Kinda took the fun away. So this second account is back to no drivers aids and I'm trying to get enough credits to buy the cars I want.