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Good thought. Reputable shop said no alignment needed -- already good. I took it to a shop to double check. It might be worth doing it again though since it's been 5k miles since then. Never do any extra squeezes.

I checked short term fuel trim (LTFT wasn't available in Torque lite, and I didn't yet use forescan), and here's what I saw: STFT at 70 mph (level highway): -3 to - 4% STFT during stop and go: -10 to -10% engine load at idle: 16% engine load at 70 mph (level highway): 45% ranger-reported mpg in...

Thanks ! Yep, it's on the list. I have a few scanners i'm planning to try shortly, (forescan and other one obdii device), but not sure which can do LTFT.

Exactly; although I may have accidentally hit instead of 5, if I said 2: my records show it was ~5k miles ago (at 2.5-3k miles ago). From that same post: "Tires are Firestone Destination At2, and my mpg didn't drop from stock (19-20 mpg) to when I switched to these new tires. I also didn't...

Incorrect :) As I mentioned, I mostly drive highway and longer trips. It does sit frequently, but can't extrapolate whether trips are short or long from the 8k miles number :)

Another item checked off the list: brakes. Running list of what's been checked: spark plugs, brakes. The brakes and rims look to be the same temperature after a long drive, with minimal braking to stop. Example of front+back thermal camera images:

Yep, am planning to do something similar -- thanks for the reminder though, as it's a point many people don't know :)

Thanks. Just to check, what is "that" referring to? The fact that the plugs look different, or that the part numbers don't match?

Thanks; so it's okay to have a bit of friction with the feeler gage? Anyone: any thoughts on the plug differences?

@Frenchy Hmmm, the replacement plugs look different when I zoom in on the electrodes, both in electrode area, and color of both sides. Did I get the wrong ones? Amazon said these Motorcraft SP578 are compatible with the 2021 ranger, so I assumed the part number was just an alternate Ford...

Thanks. Ah, so it's either there, or missing. Sounds good -- i'll check.

I see, thanks; I guess i'm used to older-style plugs and so may have made a mistake by checking :) So pushing a 0.030 wire gauge through (some minimal / non-zero resistance) could have damaged it? There was definitely some small pressure I needed to put on it, to push it through. Is there a way...

Yeah, actually in the meantime I thought of using my thermal camera as well, so that seems best :) Yep, agreed, and thanks for the reminder/encouragement! I'm working my way through a list of things to check from this thread, eg checking plugs, so it'll take some time but there are actionable...

Ah, this is a neat approach. Just to make sure, you mean the wheel rim, right? Will brake heat transfer well through to an aluminium rim? Interesting; what makes you say that? BTW I looked at this link here and here after reading your comment, and then realized that I didn't include an angle...

#4 spark plug (closest to windshield) looks great overall, as expected for 8k miles. The gap is right at 0.030 using wire gauge tool. Not sure it's worth checking the other 3, as this one looks so nice... Edit: added 3rd pic based on comments later on. Note: Ford's manual doesn't recommend...

Referring to the technical manual, it says the following for stock iridium plugs (as indicated by 12405) Spark plug: 12405 Spark plug gap: 0.0295 in (.75 mm) But everywhere I look online, people say 0.030" - 0.032", with the "default" being 0.031. Is the manual not to be followed? Or does it...

No running board, no skid plates (I removed them), I purchased a front air dam instead and put that on my fx vehicle instead because the mpg was so bad, and yes I have mud flaps (but have had them since the start from factory) none of these mods. forescan: no mods beyond cosmetic, ie no...

Makes sense for leveled / bigger tires. That's still much higher than my 17-18 at the lower speed of 65...and my vehicle isn't leveled :)

Yep, that makes sense for stop-and-go, and I agree the ranger doesn't like that :) Unfortunately I see that mpg on the highway though when driving steady at 65 mph.

Road slope can change in each direction, as well as prevailing winds that assist or resist motion, temperature could be different that causes different tire pressure, etc.