Gas Mileage issues

Today’s fill up and associated pics i said previously Id post.
Love this rig and it does better than i expected.

 

Clearly, all of your routes are downhill both ways.

 

LOL
Favorable daily route and optimizing coasting technique.
Also bone stock so weight not up…

 

I was getting about 14 mpg until after 50k i noticed i dropped down to almost 12 mpg, i changed the air filter, cleaned the throttle body, started filling up using only top tier gas and been using marvs mystery oil on my fills up and mpg improved by 1 mpg. I also did change my battery after 3 years cause i noticed it was taking a bit longer to crank on start. Could be any of those but regular maintenance def improves mpg

 

I use top tier gas 87 .shell..I had the MPG in winter 17MPG...but I used SN PLUS engine oil..now the air temps driving in the afternoon I reset the MPG dash panel and I drove it 65 f air temp and then the MPG is around 20 MPG.. in the summer it will be 21 MPG.. but I inspect and clean the air filter also..I put a air blocker to cover the radiator in the winter temps zero to 40F..engine runs very good and increases the heater air temp ...
now I will remove the air blocker in march last week...

 

I’ve put about 2000 miles on my 2018 since adding a Gobi rack. I have 265 KO2. The dashboard tells me 18.2 mpg average. I’ve calculated just over 19.2 mpg on couple of those tanks. 80% of that driving at 65-70 on highway with rolling hills. I think the wind on the rack and those heavy tires cut at least 2 mpg.

 

I've been trying to set a PB for how efficiently I can drive the 4R. May as well try this since I don't plan on going fast with this truck anyway. The efficiency definitely takes a hit once you go past 70mph.

Photo from tonight. Mostly flat highway, never went past 65mph. Traffic was mostly clear. Stayed on the right lane. Stock ORP. currently averaging 19.1mpgs for the lifetime of the vehicle (~3100 miles on the odo)

 

Just a thought, I run only non ethanol. It’s either 87 or 91 depending on how I feel. Since I run non ethanol I know the fuel is consistent. I know regular 87 has 10 percent ethanol. I have also heard it can run as high as 15 percent? That might be some of the reason for the vast variation. I like non ethanol.