I realize the computed MPG on the display is typically off from (and usually higher than) actual calculated MPG using gallons to fill up and miles driven on previous tank... But I found a surprising anomaly (?) on my second fill-up: the displayed MPG is higher on my second tank than what I got on my last tankâ€”but the calculated MPG is lower. This is from filling my tank at the same gas station, not topping off, and taking careful notes. I bought the car on 3/27 (with maybe 6 miles on the odometer?) and since the dealer filled up the tank, my log is blank for that fill-up. On 4/14 I put 7.984 gallons in and recorded that I had driven 338.5 miles on that amount (for a calculated actual MPG of 42.397); display MPG was 43.4. I then reset the Trip A meter. On 5/11 I put 8.139 gallons in and recorded that I had driven 335.1 miles on that amount (for a calculated actual MPG of 41.172); display MPG was 44.0. I then reset the Trip A meter. Based on other threads here I would have expected the display MPG to be consistently lower than actual MPG; but I did not expect the actual MPG to be lower on the second tank even though the displayed MPG was higher! Can anyone help explain why this happened? Am I calculating this wrong? Or maybe the 6 or so miles on the odometer when I bought the car throws these numbers off? My understanding is that I should take my current mileage and divide it by how many gallons it takes to fill the tank on that dayâ€”because that is how much gas you actually used to get to that current mileage. Is that not correct? (Disclaimer: I am not a math whiz) Thanks.