Curious if anyone else is having issues with RF gas. We started using them near exclusively since they opened for our two vehicles. Both have been gradually getting worse in terms of running and mpg. Our Mazda 3, which was near exclusive to RF gas, ran pretty badly and a few weeks ago stalled twice leaving the house. Took it to the shop and they said it was extreme carbon buildup in the fuel system. They did a complete fuel system clean and its running pegreat now. Thinking the same thing was going on with our van, I've now run several tanks of (Exxon) gas with fuel system cleaner additives and its back to running smooth and the mpgs are up as well. Could very well be the age of the cars, but wondering if anyone else has seen similar issues with RF gas.