One thing to keep in mind is that this particular IndyCar's aero appears to be set up for high speed, oval Speedway. In any case, let’s take a look from the top-rear of the IndyCar…
…and compare it to the F1 car. Per the rules, an IndyCar is to be at least 192 and no more than 78.5 inches, while an F1 car cannot be wider than 78.7 inches but has no limit to length. Somehow, they all end up being very similar in length. Since an F1 car doesn't refuel, an F1 car will weigh a 1548 lb minimum with driver and fluids at the end of the race, while an IndyCar setup for road course weighs about 1575 lb, but not including driver and fuel.
Take a look at this very cool mobile toolbox unit on display at the HRP Racing products booth. Maybe I could get one of these to start a smaller Snap-on tools-like mobile franchise. Would you buy from me? 'I give you special price.'