Just didn't drive the XFire much that year - only 410 MPG miles. And all of it around town on short trips or to local car shows. Calculation just turned out that way. If you look at the PDF I attached, you'll see I keep track of mileage two ways - DRIVEN & MPG. The DRIVEN mileage is the difference between ODO readings taken on the 1st of every year. The MPG mileage is the difference from last fill-up for each year. Never the same - most times not even close. MPG is calculated using MPG miles; OPER COST is calculated using DRIVEN limes.

And I keep track of MPG during extended road trips (i.e., Eureka Springs in 2015, ToD Weekend GTGs, etc.). During Fall/2017 ToD Weekend, XFire got 25.8 M mpg. Not bad for up & back + semi-spirited mountain driving. Out to Eureka Springs in 2015, XFire averaged 26.1 mpg out & back + Ozark Mountain cruises. And the car consistently has gotten the mileage over the 9+ years I've owned it.