Using a dynamometer w-o a wind tunnel, is inaccurate simulation of usage

in a warm / hot climate, because @ high rpm, vehicle will be
moving @ high speed : the air cooling received by battery +
alternator + inlet manifold ( usually heated by radiator coolant
) + exhaust manifold & pipe & muffler will increase torque.
Only in a wind tunnel with air flow @ the same speed as vehicle
would be @, can simulation of usage be accurate.

I removed my bonnet's 3 rubber seals & small front grille to
let in & out more air : in 28 - 30şC air I found that @50 kph,
torque rose 5%, @90 kph torque rose 10%, I think @110 kph
torque incr will be >10%.
E.g. BMW's oil sump has grooves for air cooling ( mine does
not ), so the impact of air flow on such a car must be even
bigger in a hot climate when its oil is hot.