Long time since I have been around this forum. For those of you who do not know me, here is a quick background;
My C-Max is 2013. At this point I have 115,000 miles on my car. I bought it in late 2012 (October) for my business. I carry about 250 to 300 pounds of equipment in my car and do mostly town to town driving. I was the first on this forum to achieve a 700 mile tank of gas. My best day was 110 miles at 61.5mpg. Paul has since radically eclipsed my mileage in individual runs. But, my lifetime mpg is an even 50.0 (even through northern illinois winters). I had been running three grille blocks on the nose of my car and smooth wheel covers to maximize MPG.
Now, two years ago I was rear ended badly and the body shop removed my grille blocks and replaced the nose of my car. Then I replaced my tires. These two things dropped my MPG to an absolute max of 53 to 54mpg if I really work on it. For grins, I decided to reinstall the original nose section and restore (repaint and refresh) my old grille blocks. The difference is staggering. My MPG went up from the 53 to 54mpg I have been working hard to achieve, to 59.6mpg in my first 8 mile test run (after warming the car up). This is great to achieve. When I made my first grille blocks, they were made one at a time. So, it was difficult to quantify exactly how much improvement I was seeing because one or two MPG here and there is not super easy to quantify. However, adding all three back at once made a massive difference. It is awesome to see a 5 to 6mpg improvement all at once.
I plan on reinstating my MPG research now that I have the bug again. :~)