GX550 Real World MPG

I’m curious for those who have bigger tire diameters than stock how do you monitor your speed? I have been using Waze/iPhone speedometer app but I’m not sure how accurate those are.
I have a mph app that I occasionally turn on and let it display speed while I'm driving on the highway. 70 on the dash display is really 75, 80 is about 86. I have to set my cruise around 75 to mostly keep up with traffic, which is really 80/81 mph.
 
I have a mph app that I occasionally turn on and let it display speed while I'm driving on the highway. 70 on the dash display is really 75, 80 is about 86. I have to set my cruise around 75 to mostly keep up with traffic, which is really 80/81 mph.
What size tires are you running?
 
So I've had my GX550 Overtrail + for a little over 1 month - have driven 656 miles. My trips mind you have scored excellent from a breaking/acceleration standpoint on the Lexus App. What is totally f'ed up - is that it took me 3 TANKS of gas to drive 656 miles - which in CA equates to roughly $320 or $0.50 per mile in fuel alone. Now, I'm truly not worried about the money - but at this point am starting to question of Lexus has completely lied to future buyers or thinking I have a river of a gas leak coming out of this thing.

And before anyone brings it up - CA makes more per gallon in taxes than oil companies do in profit per gallon...
 
7300 miles, and here are my mpg stats in my OT with stock tires
 

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Clicked over 1K miles this week and filled up again today with hand calculated 16.5, OT+. Wife drives it mostly around town and has a heavy foot.

It's pretty much close to what my Tacoma gets, which has significantly less torque, isn't full time 4WD, weighs a bit less less and on smaller tires. I'm not mad about the MPG at all.
 
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