I can't talk about the underbody panel itself, but like the earlier poster said, everything counts.
I had lost the driver side "air dam" that sits in front of the tire, and also the inner fender. (I hit some road debris...)
I've been doing some long distance commuting (700 plus miles each way) on Interstate 80. With the damage, my mpg was hovering around the 50 mpg number. Once I replaced them I slid up to the 60 range. This all at "highway speeds"....
(I also pulled off a 70 mpg trip, but in that one I kept my eye on the display the whole time, drove in the Carter speed range, and despite teh weather, kept my a/c off. I ain't doing that again).
Oh, a picture of my mileage display on that last trip:
No, I've got the air deflector strakes as seen in the image linked here. The left side strake is seen from the back under the car similarly here where the thumb is pointing. Note the holes at back of the strake.Is your car missing the Air dams in front of the tires? These I would think make the biggest difference with MPG, as I read these were specifically designed for Aerodynamics. These would probably help MPG much more than the $40 dollar panels you replaced.
That would be great.I'm going to take some detailed pictures of the under body of my car so that I can find out exactly what I will need. It seems that there is a metal bracket bent at the very bottom, I think this would be a #10 Beam, Cover.
May just need a bigger washer, or maybe a strip of flat aluminum or stainless steel etc to bolt to the polypropylene underpan. If you can trap the better part of the plastic likely no worries if it's open one side but ...Plus I have other problems, like the bumper holes that hold in one of the underbody panels has been completely torn, so it is not a complete circle anymore and the clip will not work with it. I will have to figure out how to get all these panels back on.
Seems I got a break on the price at the big Honda dealer here; the UK site says 2x price i paid locally. It was available 2 days later in Ab Ca here.I have been looking for used body panels but they seem to be almost impossible to find. I think it will cost me about $350 to get the body panels new and I just might order them then wait around for used panels.
Best I can do now for the back panels without a pit and just some plastic ramps is seen here from a couple images in from when I put in the front underpans.Maybe if you or someone else could take detailed pictures of what it looks like under your car that would be helpful for me to figure out what I will need. It is hard to find Insights around that I can actually look at underneath.
I'd be guessing but possibly behind the bumper in front of the rad apron???, I did not notice these on my car when down there. Looking at some wrecked cars in the knowledge base may show some of the part in question exposed but it's hard to tell.What I am wondering about is where do those panels #5 & #7, go?
Can't tell from pics, just an opinion here, but if there are tears in other front sections of the bumper, maybe it's broken and pulled out. If the holes there are symmetrical on both sides i'd say it's likely normal, but otherwise likely not and broken at a guess.Are the holes in the bumper that hold in the air dams broke, or are they cut like that normally?
I hope it may save some grief, in addition and not initially mentioned, as the plastic panels would not have prevented it, ...but the oil pan on that vehicle was dented, because of the very uneven rutty road surface, and oil pressure light showed up on idle. What a mess.I was planning on pulling my underbody panels off for the winter, as I've already ripped one off and repaired it going through a deep puddle at speed, I figured having them on when trudging through 6" of snow seemed like a bad idea.
Can anyone tell me the part numbers for the underbody panels under the middle of the car? I need a few of the plastic ones near the exhaust, under the seat area.