Gas prices seem to vary widely across the country. Some of it has to do with varying state taxes, but… ?
In any event, gas isn’t selling for “$1.98 per gallon in a few states”, despite one person’s statement to that effect. The last I heard, the average price nationwide was $3.14/gallon.
The Costco near me is currently charging $2.78/gallon.
On a related note, I read this morning that Costco is beginning to open free-standing gas stations that are not located next to one of their warehouses. The first one will be located adjacent to an expressway in Mission Viejo, CA, it will have 40 pumps, and–like their other stations–will only be open to members.
On my Mustang the average fuel economy is typically around 0.3 MPG optimistic in everyday driving (~10 miles a day, semi-rural conditions (40-50 MPH speeds, with a couple stop signs/lights along the way). On longer highway stints (~280 miles at a time, 70-80 MPH) it’s just about dead on, usually within 1/10 of an MPG.
For the F-150 there’s more variance. the display is about 0.5 MPG optimistic is typical day to day driving, but closer (0.2 MPG) optimistic highway driving.
Both are close enough for my needs, but I still double check with a calculator at every fill up.
If you want to get an even better idea, keep a log for like 1,000 miles. There’s just a ton of variability in terms of driving and some also in term of just how full the tank gets before the pump’s auto shut-off. I’m sure what you got was pretty close or maybe even right on. But you can eliminate random error with more miles.
My price can vary 20-30 cents up or down from week to week. I’ve just quit pondering it unless we get back to 4 or 5 dollars again. I think a lot of it depends on the source of oil and the refineries. I think ours comes out of Canada and we have more or less local refineries. If you eliminate the refineries in your state, good luck.