Whilst not calling anybody a liar, some of the claims made need to be examined in the light of the following real world empirically derived formula, which ignores rolling resistance and other parasitic losses.
Power = 8.702 x 10**(-6) x Cd x A x V**3
where Cd = coefficient of drag
A = square feet of frontal area of the vehicle
V = Velocity, in miles per hour
Code:
Speed Power Required
m.p.h Horsepower
30 1.6
40 3.9
50 7.6
60 13.2
70 21.0
80 31.4
90 44.8
100 61.4
110 81.7
120 106.1
130 135.0
140 168.6
150 207.4
160 251.7
170 301.9
Whilst the figures above are purely theoretical, they do appear to align fairly well with published road test figures. Claims of a standard car exceeding 150m.p.h. by more than a couple of miles per hour would seem to indicate either the assistance of a stiff tailwind or a downhill test track.
Conversely, it shows that an SVX that cannot exceed 130 mph is really severely out of tune.