Hello Everyone
I have a 2005 Mazda 3 hatchback and i was wondering what you think the largest area for aero improvement would be if i could only do one mod.
I was on the fence between wheel skirts, a 24in roof extension or a diffuser. I would eventually like all 3, but what has the biggest effect on it own?
I am leaving on a 700 mile trip in a week and would like to make an improvement on my 32mpg average I'm getting at the moment.
Thank you for your input
