WRXB215

Sporadic E, "E skip or Es" is fairly rare at 144 MHz but several instances are documented every year in the ham community.  There are rare instances where Es has reached up to 222 MHz.  I am not aware of any openings in the 440 MHz range so I would consider this propagation mode unlikely on GMRS.  Es happens primarily in summer (late May to mid August).  

Tropospheric ducting or "tropo" is fairly common east of the Rockies, mostly in the summer through fall.   Below is a current map of propagation links from automated data stations in the 144 MHz band, https://vhf.dxview.org/.  These stations would be typical in power to GMRS, but at VHF.  Paths in red may be usable at GMRS.  Tropo commonly is usable above 440 MHz and even well into the GHz range with enhanced conditions.  Tropo can cover a few hundred to 1000 miles plus and is documented at over 2500 miles.  




Here is a tropo propagation prediction map that shows strong potential paths in many areas of the eastern US last Tuesday.  It does show a gap between MI/LA but it is only a modeled prediction based on weather patterns and at a specific time (1200 UTC).  A path could develop as the weather changed through the day.  These Hepburn, https://dxinfocentre.com/tropo.html maps are used by hams and other listening enthusiasts to find long haul propagation. 


 
Another way to find enhanced propagation is to listen to empty FM broadcast and NOAA weather channels in your area.  

I am assuming it's receiving noise/static? If so, There are a few possibilities:
The squelch is set too low. Try turning it up to 9 There are actually signals (static/interference/bleedover/illegal digital) coming in. Try listening with another radio to see if it comes in on both or just one radio Something in your Jeep such as LEDs, PWM, ignition, or lord knows what else, is causing noise/static interference - Good luck if this is the case Something else that i'm not thinking of that the other good members here will list below

No. Generally mobile equipment is designed to operate at a nominal 13.8VDC plus or minus 15 percent at most. That would be nearly 16VDC on the high side.
Take a look at the manual at the following link. 

https://www.buytwowayradios.com/downloads/dl/file/id/1411/product/5287/wouxun_kg_1000g_owners_manual.pdf
Look at page 80.

Most (not all, but most) repeaters will give you a "kerchunk" or squelch-tail sound after you unkey.  Some may have a roger-beep. If two repeaters in the same area are using the same channel and same tones, you wont know which you're listening to unless the signals are different enough to tell them apart; ie; one might be strong, the other might be weak.  Generally speaking, you will never find two nearby repeaters on the same channel with the same tones because it would be a clusterphuc. My bet is that one is out of service or its a duplicate listing. (Bonus response!) Welcome to the exciting GMRS lifestyle!

The smaller one is quite springy, but the larger one is VERY stout and VERY stiff.  I would not recommend putting it on anything less than a large span of solid steel.

That’s exactly the kind of thing you should turn in to the FCC. 

If only there was a YouTube channel where a brilliant host would provide useful commentary, wry sarcasm, and offered tips on how to get chicks…..

Hehe, I had a hard time reading that at first. 😆

“Section 95.1767(a), to allow the devices sending digital data to operate at 50 watts instead of the current 5 watt limit.13 In its Waiver Amendment, Midland argues that operating at higher powers will better serve the safety needs of and real-life use by off-road users.14 Midland also states that GMRS device users will be better served by data transmissions, as opposed to voice messages, because data transmission are more reliable and more accurate.15 Further, it claims that allowing a 50 watt power limit would enable a data transmission range of roughly 5-6 miles, as opposed to .5-1 miles for 5 watts, which would better serve the needs of users.”
 

Try going into your phone’s Bluetooth settings and select forget device, then repair it as a new device. 

They are here to learn just give them information's that they need to get started, and start them on their way

Yeah, i never understood that personally.  There is a pretty valid reason for using ch19 on CB. It is the center of the band and most AM and SSB radios were tuned for max power on 27.185 MHz. Also, properly tuned antennas are tuned for that frequency as well.
 
That mentality is non-applicable because the center frequency on GMRS is not a usable frequency and no where near channel 19 or 20 (462/467.65 or .675). So picking any channel is really just picking a number for the sake of picking a number. It doesn't serve a purpose. Honestly, I don't even think saying that copying CB for ease of use is valid, because of all the GMRS users I know personally, many of them never used CB and think ch19 is "the trucker channel ".

Really? He said this in his first sentence.
Channel 22 aka 462.725. If he knew exactly where the repeater was there would be no question. 
@WRXB440 channel 22 is simplex so if you are trying to reach them and they are on a repeater you’ll need to be on the equivalent repeater channel like channel 30. Of course you’ll need the proper tones. You’re right there doesn’t seem to be a 462.725 repeater that close but there are a couple outside of your area. You could try finding the ones on the map page that match that frequency that are closest and add those tones but there’s no guarantee your radio will reach the repeater as the repeater signal very likely will be stronger than what you’re sending. @marcspaz is probably right. And frankly he knows this stuff better than I.  Keep listening maybe you’ll get some info. Good luck. 

There are 2 possibilities, E Skip or tropospheric ducting. Based on your location, it's most likely E Skip. 
 
Sporadic E propagation (known simply as E Skip) reflects signals off relatively small "clouds" in the lower E region. E Skip propagation supports long distance communication during the approximately 6 weeks centered on summer solstice.
 
Tropo ducting also happens this time of year, when radio waves travel along temperature inversion ducts, but that is not likely what you're experiencing. Tropospheric ducting normally happens near and along water. In the US, that translates to mostly the Gulf Coast and East Coast. 

Two groups, Popular Wireless and Personal Radio Association came up with the idea of an Open Repeater Initiative (OPI). It was designed to get repeater owners to open up and share resources instead of locking down systems. The idea was to make it easier for GMRS users to find and access repeaters. 
 
The group established the 141.3 CTCSS/PL as a “travel tone”.  Originally, the repeater pair 462/467.675 was the OPI frequency (aka today as the travel channel). However, OPI eventually morphed into any repeater pair using 141.3 for PL access and did not require prior permission.
 
Well, OPI and the founding groups are long gone, but many repeater owners still honor the spirit of OPI on their repeaters.  In the absence of OPI, there has been debate in the community over what should be put into place, if anything. There is merit to all sides, but there are trolls that stir the pot, too.

Decades ago, the FCC designated a frequency* (pair 462/467 repeater) as an Emergency/Traveller Assistance frequency, and it was commonly recommended that (as I recall) a CTCSS tone of 141.3 be used with it.
* In those days, one's license specified TWO of the eight main frequency (pairs) and those were the ONLY main frequencies one could use for general communication. Since many radios of the day only had an A/B (or 1/2) select switch, it was common for practically everyone to specify the emergency frequency as one of the two licensed frequencies (the emergency frequency could be used by anyone /for/ emergencies, but if your radio only and A/B and neither was set for the emergency frequency, one was out of luck.
There were no "channel numbers" in those days. My "A" channel could be totally different frequency from your "A" channel.

https://www.texasgmrs.net/ has almost every repeater in Texas.

Most likely that's just BS. Manufactures still stick crap like that on their products hoping some will believe it.
https://consumer.ftc.gov/consumer-alerts/2022/07/ftc-says-companies-warranty-restrictions-were-illegal

I would add to @Sshannon’s info that most GMRS radio (if not all) will have this +5 offset already added in the preprogrammed channels for repeaters. 
 
21: TONE-SCAN] CTCSS/DCS Scanning
Function: Scans the incoming signal for CTCSS or DCS tones to identify or confirm the correct tone. This function must be activated while receiving a signal.
Options: 1. CTCSS/2. DCS
Default: None. Choose the function and press [MENU] to activate the scan.
Note: The scan will stop when the signal ends and resume from where it left off the
next time the signal is received, until it identifies the correct tone. Use the [UP]/[DOWN] arrow keys to scan in a different direction

I wonder if the frequency limits setting has anything to do with this?

The default offset is +5 MHz for GMRS.  So, if your repeater is transmitting on 462.550 MHz you will transmit to the repeater at 467.550 MHz.
As far as searching for tones, the feature is probably covered in your instructions.  It will be called “scan for tones” if it is.  But you must be scanning the transmit frequencies to be certain because the transmit tone is not always the same as the receive tone. It’s usually better to just ask for access and be given the tones.

To actually answer the question:
On all radios manufactured since 2017 all GMRS and FRS channels are the same and all GMRS radios can talk with FRS radios and visa-versa.  Most mobile GMRS radios may not have some of the channels (8-14) on them, but otherwise, if you put both radios on the same channel, you can talk. Narrowband and wideband radios can talk to each other - however you may notice some volume issues; many people do not notice at all.
TL;dr:  You can use your FRS radios and your MXT275 without any significant/real-world issues.

GMRS radios, those certified under 95e, are GMRS Stations.
In order to use a GMRS Station, you must be operating under the authority of a licensed user.  In that instance you must comply with all of the rules in 95e, including those regarding identification (using your call sign)
FRS radios, those certified under 95b, are FRS Stations. If you're using one you are required to comply with the rules of 95b.  It's that simple.
No license is require to use an FRS Station. The rules for 95b do not require identification.  It doesn't matter if you have a GMRS license.
When a GMRS station talks to an FRS station, the person operating the GMRS station is required to follow GMRS rules. The person operation the FRS station is required to follow FRS rules.

My UV-5R GMRS flavored radio transmits fine on GMRS Ch15 and VFO 462.550 The Low/High power (#) does not work on mine in Channel mode, but does work in Frequency mode  No problem connecting/programming on multiple computers - Statistically speaking, unless you know that your computer/cable works/can program other radios, this is more likely a Windows issue than a radio issue.