Originally Posted by
Havocwreaker
As poor as his use of grammar is, my sentiments are similar to that of parraboi.
My course is Aerospace engineering, but I'm also doing a project with cars. Check out youtube with the search string 'formula sae'.
I made my comments off the back of some research i did specifically on undertrays and under car aerodynamic devices. Granted the application for a formula sae car is different to that of a road car, but the principles remain the same.
My point is just this. Unless you spend a lot of your time driving faster than the speed limit, you won't see significant savings in fuel or an increase in performance.
The proof lies within the data you provided. How long do you spend driving at 100kph+? At 100kph, from the graph you've posted, there's less than 3kW of power difference in the power required. The Civic isn't exactly a powerhouse, but it can spare 3kW.
That's all my point was.