Under "Basic Stats" for my Honda GL1800 Big 6, on line 1 $2.43 is shown for average price/gallon, on line 2 it shows $2.54 for average price/gallon. What is the difference in the way they are calculated ?
The 2nd line says: Avg Price/Gallon $2.54 (30 Days). Which means that's the average for the last 30 days. The "30 Days" is in light gray, so it's possible the contrast on your monitor is set so you can't see it.
The top line is your average price across all fuel-ups.