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Make sure the car's running gear and engine are at equilibrium before running the first test. This means fully warmed up. A 5 km drive will not be enough.
Instead of evening runs I suggest early morning runs. The atmosphere is at its most stable before sunrise and there is frequently no wind. Traffic is at its lowest in early morning too.
Make everything about the car the same so you can get comparable results across several days. For example, full fuel tank, no extra weight, tire pressures.
if possible, perform a calibration run or two before and after each test series where the car is set to zero state (i.e. no mods). This lets you know if things have changed during the series, and if each series is comparable to runs done at other times. These calibration runs also let you correct for factors beyond your control, such as seasons and temperatures change.
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