Fuel economy on 500s in general is excellent. I have found that the engines are really "tight" when brand new. On my first tank (50/50 city/highway) with the Abarth, I couldn't crack 30 MPG. At 4000 miles, I'm now at 38.8 mpg on the exact same route.
The other Fiats I have owned exhibited the exact same behavior. As with the other 500s, I expect a further minor improvement in fuel economy, leveling out at about 5000 miles.
see full Fiat 500 review
Considering it's got a big turbo that I can't help but make use of, I still seem to be averaging an odometer-confirmed 30mpg in mixed driving (high speed mountain freeways and congested city). I've had a few flatter road trips creep into 33mpg territory, and a long run of backroad-strafing dip down to 27. Overall, I'm happy with the economy considering just how fun to drive the car really is.
see full Fiat 500 review
2015 Fiat 500 Gas Mileage (MPG)
Unlike other fuel economy surveys, TrueDelta's Real-World Gas Mileage Survey includes questions about how and
where a car was driven. So you can get an idea of the Fiat 500's
real-world MPG based on how and where you drive a car.
What Our Members Are Saying about the Real Gas Mileage of the 2015 Fiat 500
5-speed manual FWD
5-speed manual FWD
5-speed manual FWD