Only way to know acreage is to measure it if it makes any difference. I measure my plots because I do soil tests and like to put the actual amount of seed and fertilizer required. Not more or less according to guesstimation. As much as it costs to properly seed and fertize, I don't want to spend any more than I have to. I was an engineer in my earlier days and still tend to be a little technical and I've always been a cheapskate.
I've got a plot that the owner told me was 3 acres and it's actually measures 2 acres. Seems like nobody is very good at guessing acreage, that's why I measure

My son in law has accused me of over estimating acreage. I tend to plant and fertilize heavier than necessary because if there's any doubt, I'll round my guess up. If it looks like 1/2 acre, I'll plant for 1 acre.

I figured it too, your numbers are about right on, however, I don't think you allowed for turning. That 6mph+ would have to be in a straight line, continuous , not slowing for turns. And then we get to disking at 6+ with no turning also.
The only operation you can make good time on is seed/fertilizer distribution. I can rock and roll spreading.

That was a might harsh.

Dang your tractor redlines at 2250? That's mighty low

540 rpms at the pto is at 2250 engine rpms. Tractor is a 4 yr old mf 2615. I really like it. 43 pto hp, easy to drive, great food plot tractor. Runs all day on about 5 gals of diesel. I bought it new. Replaced a mf 165 that I still have, that has a gazillion hours on it and is still going strong. The 165 has 53 pto hp and only burns about a gallon or so fuel/hr under a full load. It made me a massey ferguson fan for life

I bet he's got some stories. Lol.

How does everyone measure the acreage of their plots? I found something called Daft Logic Area Calculator that I used one time to measure area using Google Maps. Not sure how accurate it was.

Most accurate way I've found is with a handheld gps unit and just ride around the perimeter of the plot using the area calculation mode

That's the best way. I use acme.com/planimeter. Can draw around the plots and get pretty dang close. Close enough for what we are doing. And can do it all from my recliner.

I've checked against my laser rangefinder and found it very accurate. It's surely good enough for things like planning deer plots.

A while. You will either love it or hate it. I could plow and plant all day everyday but I have to go to work.

On the bush hoggin your tractor throttle should be set at whatever RPM gives 540 at the PTO (if that is the gearbox speed and not 1k) and leave it there. It doesn't hurt anything to run it slower but the blade tip speed isn't what it is designed to be. Thus... you have to go slower to get a good cut.

So if you are cutting slower than around 4mph (3.5-4.5) with the utility tractor type setup we are discussing here you need to check it out, get the RPM up sharpen the blades, etc. And if all that fails and you are worried about it you need to go down a foot in width.

All that matters if you are burning gas an paying someone to run it. In that scenario you can also run too small of a cutter. However, If you are just enjoying the sunshine all that is out the window. Doesn't matter if you are going 1.5mph.

Google Earth (not Maps) will give you the area of a polygon that you draw. A much simpler estimation is simply using the scale found on google Maps. Granted, the estimation using maps has to make some allowances for irregular shaped fields. I estimated our clubs plots and compared them to a guy who calculated them so he could give us a quote on planting. I was off by less than an acre and we're talking 40 plots covering 33 acres, so I guess you can safely say that the estimations are 95% accurate, give or take a little.

Under further review, it's 540 pto rpms at 1800 engine rpms. At 2250 it's 680 pto rpms. It's around 4.5 mph at 1800 rpms, it's all good.