I finally did all the computations for our trip back to Oklahoma and Missouri. I kept all my receipts and noted all the mileage numbers each time I stopped for gas.
We rented a new Kia Forte from Alamo for $16 a day, which was about $224 for two weeks. We rent to help keep the mileage low on our personal autos, and it also gives peace of mind about car breakdowns and such. It is worth it for us.
Here is a picture of the car we rented.
We traveled 3961.9 miles total.
We used 120.65 gallons of gas.
We paid $320.63 for gas on the trip.
We paid an average of $2.66 per gallon.
Our average MPG (miles per gallon) was 32.8.
The cheapest places to buy gas were:
Flying J fuel stop in Kingman, AZ - $2.59
Toot-N-Totum gas station in Amarillo, TX - $2.64
OnCueExpress gas station in Oklahoma City, OK - $2.48
Flying J fuel stop in Joplin, MO - $2.49