I just got 2 x marcos (fly) and 2 x scalex MG lolas, on a 2 x 8 straight oval (R2 curves) the marcos was a 2.7, the lola was a 2.5, the reference car being a F1 Renault (not the current model) which was a 2.2, faster than the current Williams Walrus nose, not really trying that hard, and not the fairest match, but for sheer speed, it gives a fair comparison. The scalex lola is quick, but the rear wing is a bit frgaile!!