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If driving is more in city and at low speeds, lot of stopping and acceleration, aerodynamics are not giving much benefit, then it is only driving which can lead to great savings, so driving like you would not have brakes would help a lot.
My 50mph speed is perhaps bit low to see really a lot of effect either, but grille block for example has given me some advantage, but my driving is purely on highway, hundreds of miles at once, so engine warm up does not play big part on my driving either.
Lowering rolling resistance and adjusting driving are important bits if you are not driving on highways, also planning driving ahead so that you take longest leg first and combining several driving needs for one should show up quite well as in short driving engine is in warmup mode and fuel economy is horrible during that.
So to judge if aero mods help or not, how one is driving must be in equation too, it can be perfectly possible that doing steady 70mph your mods might have shown slight improvement, but if your driving is in city or slower speed, shorter trips, then of course aeromods are not much of use and savings must be looked elsewhere.
That said I don't really see a lot of change in fuel economy when I add 200kg to my car, but weight savings are perhaps bit better when doing lot of stop and go traffic, which I don't never do, so it is important to note how one uses car to be able to see if mods will do good or not.
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