Web and iPhone avg mpg different

[TXEditionLB4x2]

I just got an iPhone yesterday, and installed the Fuel Tracker app from the App Store. What I noticed right away is that the average MPG (15.8 mpg) on the iOS app is different from the Running Avg (16.0 mpg) on Fuelly.com. Why are these different? Is it a bug, or are the two numbers calculated differently?

[Draigflag]

Could be wrong, but average is from every fuel up from day 1, running MPG isyour average from your most recent fuel ups.

[waterboysh]

That is correct. On the website, go to your profile and look at your cars Running MPG average and then click the car and look at the average mpg. Two different numbers usually.