Yes!   Choose the Earn Coins and Rewards Tab and look for the 10 gallon reward offer.   The tile will show the amount of fuel you have purchased towards the 10 gallons.  For example, if you pumped 5 gallons it would show 5/10 with half of the progress bar filled in.   If you pumped 8.57 gallons it would show 8.57/10 with the appropriate amount filled in on the progress bar or if you pumped 20.6 gallons, you would earn 6 coins and the progress bar would show the remaining 0.6/10 gallons.