I like to keep track of my fuel consumption data to monitor fuel efficiency, and to see if gas stations and price make that much of a difference, and I use the recommended premium fuel. There are a couple receipts that were missed or lost, for those I averaged the surrounding data and filled it in, out of 66 tanks two were filled out this way. The total fuel cost to travel those miles was ~$2856.

The cost to drive my Mini Clubman one mile with the cost of premium fuel per gallon.

The fuel efficiency has not changed over the one year I have been driving the vehicle. The jumps in efficiency are when I do my annual pilgrimage to the great southwest, this is where I am from and where I love to go back and see many many loved ones, and most importantly do some hiking and get some air! The slight increase in efficiency in recent months is due to moving to the city, so there are more highway miles. Chicago highway miles should have their own category IMO.

Fuel efficiency with spikes during holiday trips.

One more chart, it highlights the increases in fuel cost as an increasing gap between the plot of monthly miles traveled,  and monthly fuel expenditure.

Miles driven per month, and monthly fuel costs.

This is an odd one, @brandonnn tweeted this- had to spread it around just too unique not to.