Anyone tried and statistically calculated aerodynamics effects,
Problem is very few of us use statistical data,
From a blog;
Mod #1: Front air dam.
Making & installing an air dam beneath the front bumper to divert as much air flow as possible away from the car’s aerodynamically dirty underside. That single change accounted for fully one quarter of their gains.
Mod #2: Partial grill block.
Another highly turbulent air pathway is the cooling system. Most cars’ grill openings are sized to keep the engine cool in absolute worst-case conditions (think Death Valley, pulling a trailer). By blocking part of the grill, they were able to improve efficiency without adversely affecting engine temperatures in normal driving.
Mod #3: Smoother tail (rear spoiler).
The aerodynamically ideal shape at the rear of a vehicle is a gradual taper that helps minimize the size of the turbulent wake left behind. But the slope of the car’s rear window (w/o diggi). By adding a six inch spoiler, they effectively changed the angle of air flow between the end of the roof and the back of the car. The result: a 7% MPG improvement.
Mod #4: Smoother nose.
While almost every new car sold today has a smoothly contoured front end, the car’s face left a lot to be desired. To partly address this, they made and installed convex plexiglass covers over the car’s headlight buckets. That small change added 0.1 MPG.
Mod #5: Reduced parasitic loads.
Back in ‘74, most cars sported a belt-driven radiator fan. By removing two of the Pinto’s four fan blades, it was made more efficient. Today, most vehicles have electric cooling fans that run on demand only.
Mod #6: Reduced rolling resistance.
Car with bias-ply tires. Switching to steel belted radials netted a 5% MPG improvement.
Mod #7: Use Tyre Wheel Cap.
Reduces the friction/air pressure in cross direction of tyres at high speed.
adopting a way to reduce the air pressure across body shouldn't heart,
As these are to divert the air pressure from body, Not to dismantle anything that disturbs the balance of suspensions etc.