Is it even worthwhile to use an app like that to save a few cents on gas?
Here in Canada it's generally more then a few cents. In my neck of the woods gas is $1.16/L(~$4.90/gal), if I travel 30km(~18mi), I can buy it for $0.82(~$3.15/gal). Usually I don't use the app, rather I use their website. But their new policy violates a bunch of federal and provincial privacy laws here in Canada, and since they operate Canadian-centric sites, they're going to have to change their policies on it again.