Struggling with 12 mpg

How many miles does everyone normally get out of a tank?

I get right around 225-230 miles

 

Gas light comes on right around 300

 

What happens at 225-230?
A tank is 21 gallons.
Q: What is a tank to you??
A) You putter to the curb because the tank is empty? (21 gallons)
B) Your needle points to E? (18 gallons)
C) Your Low Fuel light comes on? (17 gallons)

For my Tacoma it depends on the type of driving, but say it is a mix of city and highway or 16 mpg.
A) 336 miles
B) 288 miles
C) 272 miles

 

My light normally comes on at 220


I usually full up 18-19 gallons. My last tank I got 12.5 mpg.

I did the miles I drove, ÷ by how many gallons i put in my tank, and multiply 1.04 for the tire difference .

 

Light comes on around 280-300 miles

Takes 18-19 ga to fill it up

Ive got a fiberglass canopy and LT 275s

 

I have a wireless obo2 scanner I leave plugged in my truck and I set a alert if the afr goes over more that 2 or under more than 2, the average (14.5). It ranges from 12-18 When driving

 

We saw in post 57 that your trims are pretty stable. I hate to say it but its probably not a fuel calculation issue.