Chuck, if you want to correct the dash readout check the link below.Mine was off a good 1.5-2 mpg and now it's perfect, I started at 944. It does take about 5-6 tanks to fully adjust.
thanks for the update. i'll admit that when i get on the truck a tiny bit it feels slightly hesitant but that goes away if i really stomp on it. on the other end it is remarkably smooth and competent driving like the 60 year old hybrid loving apolitical person i am.
My MPG is lower on 87 octane. I've used it a few times. The decrease in MPG is similar to the decrease in cost from 92 -> 87, maybe more.
This has been beaten to death on here many times. Some will swear it does while others swear it doesn't. When I changed over from 87 to 91 (highest we can get here) I did notice a slight increase in mpg but then a tank later I tuned mine. With both I gained about 2 mpg but the overall responsiveness of the truck is well worth it IMHO.
Personally, no, it doesn't. I certainly get better MPGs with the higher octane but it doesn't make up the difference.
That's a good point Jim, so many get caught up at the price at the pump. If you drive a lot of miles than it's a concern but for the average driver it doesn't add up to all that much for the benefit you get from it.
I agree with @AzScorpion. This has been beaten to death. If you ate running your Ranger bone stock, like me, and the cost difference between 87 and 91-93 is less than 10%, unlikely. No, it does not make up the financial difference. It becomes personal opinion if the slight performance gain is worth it to you. Like @AzScorpion the highest I can get is 91 octane. Yes there is a performance difference, it does run smoother, pepper and get 1-2 mpg more. But, it costs 30% more. If I had a tune and was a few years younger
I might think differently. If you like and use the extra performance you probably won't get the extra mileage. 
One of the bonuses of using Fuelly to track your mileage is it also breaks it down to cost per mile. I’ve run both flavors and I get more bang for my buck with premium 93.I agree with @AzScorpion. This has been beaten to death. If you ate running your Ranger bone stock, like me, and the cost difference between 87 and 91-93 is less than 10%, unlikely. No, it does not make up the financial difference. It becomes personal opinion if the slight performance gain is worth it to you. Like @AzScorpion the highest I can get is 91 octane. Yes there is a performance difference, it does run smoother, pepper and get 1-2 mpg more. But, it costs 30% more. If I had a tune and was a few years younger
It all comes down to a personal choice as it will never pay for itself on a purely financial basis.
i've got an open mind. some of these responses are saying i'd get an additional 2 mpg by upping the octane. like i said before i'm averaging 27 mpg so i'm going to try it. that would give me 29 mpg and over 30 on the 55 mph roads up here in elk snout, maine.I agree with @AzScorpion. This has been beaten to death. If you ate running your Ranger bone stock, like me, and the cost difference between 87 and 91-93 is less than 10%, unlikely. No, it does not make up the financial difference. It becomes personal opinion if the slight performance gain is worth it to you. Like @AzScorpion the highest I can get is 91 octane. Yes there is a performance difference, it does run smoother, pepper and get 1-2 mpg more. But, it costs 30% more. If I had a tune and was a few years younger
It all comes down to a personal choice as it will never pay for itself on a purely financial basis.
At 0.70 extra I wouldn't do it myself. You will see improved responsiveness but you could just run 87 and use S mode and get the same for less money. I go to either Costco or Sam's and it's only 0.35 difference from regular to premium so it's worth it for me and I don't drive a ton of miles as everything here is close by.
I've never used 87. When we put gas in it the first time we pulled out the owners manual. When given a choice, I always want the best overall vehicle and engine performance. So we've always used 91 or better top tier fuel.
