The "DR1VE ECO experience" will feature a driving simulator which allows customers to see how economically they can drive, an eco survey and Fiat’s Aria concept car.
The Aria concept was first shown at the Geneva Motor Show in March and runs on a mixture of petrol and methane-hydrogen.
Tony Dittli, managing director of Fiat Marylebone, said: "This is a wonderful opportunity for us to show customers and anyone interested in helping the environment, what Fiat is currently doing in this important field."
Every visitor who takes the eco survey will receive a card for London travel worth £8, redeemable on all public transport in London.
Fiat has recently launched the Bravo 1.6 16v MultiJet Eco in the UK – a mid-size hatchback that returns a manufacturer quoted 62.8 mpg and has a CO2 emissions output of 119 g/km.
It will also be on display at the eco event along with the 500 1.2 Petrol and 1.3 16v MultiJet, Grande Punto 1.3 16v MultiJet, and Panda 1.3 16v MultiJet.