Yo! We're driving yet again to see my parents in Charleston, SC. We are taking the G4 that has the new 14 x 4.5" alloy wheels and Barum Brillantis2 175 65 r14 tires. I already feel the engine is a tad more worked after putting these on so I'll report my fuel economy for all who go with this combo in the future. Considering the last road trip I mostly did 75 mph with the original OEM wheels/tires and was only avg 35 mpg I'm guessing it's going to be worse. It won't break my heart though those Barums on my hatch have Zero uneven wear after 5k miles and my hatch is slightly out of spec too. Fuel economy suffers though but it's a trade off because the beefy tread really holds up to potholes fantastic and road noise is less.