I did some interesting back to back testing last night. First heat on foams my faster lap was in the mid 11's. in round two put some mini's on and I recorded a slightly quicker faster lap and found the car was possibly a touch slower round the corners but I could go so much quicker over the jump at the end of the straight the overall lap time was nearly the same.
So for me there is nothing in it other than the cost implication. Minis last s couple of meetings, my foams are two seasons old and will easily do another year yet.
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