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Just use Fuelly or a journal. All gallons and all miles. Engine hours, also.
MPG shouldn’t be an isolated number. Not useful by itself. Needs to be paired with average miles per hour.
The pair need to be seen over about 3-5000 miles for an accurate snapshot. Tank by tank is worthless.
A full calendar year to account for weather and other changes.
Bring to annual cost per mile. Dollars spent and gallons received. Expressed as cents-per-mile.
At $3/gl my annual cost is .08/CPM. Been this for years. The variance is fuel price. I only need estimate miles driven.
If you want to cut fuel budget it’s as much about miles driven as vehicle spec.
Stunt driving might be fun, but it’s a dead end.
How one fills tank, etc, is beside the point. Cut the miles to achieve same end. Exert discipline about idling.
The rest just doesn’t matter.
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