Superheroes are all about saving the world. One of the (many) problems we're facing is the shortage of natural resources. Think about when you go to the gas pump. Prices are (once again) slowly rising. What about the cost to travel by airplane? The price of a ticket has gone up yet most airlines now charge you for food and for checking in luggage.
People need to travel. Whether it's for work or recreation, the need will always be there. Superheroes may be out saving the world on a daily basis by stopping supervillains, bankrobbers and muggers but what about the bigger picture? Couldn't they use their super-feats to do more than just stopping crime? It can't be a matter that they don't want to overstep the progress of mankind because they're interfering with daily events all the time.
== TEASER ==
If it's a matter of trying to drill in the right area, Superman could use his x-ray vision to figure out where the best locations were. There's usually the factor of disrupting the wildlife or natural environment at new drilling locations. Surely Superman could dig a proper path that wouldn't endanger any of the local residents that were sitting miles above any oil hotspots.
Many heroes have a combination of super strength, speed and the ability to fly (or jump in cases like the Hulk). What if commuters or vacationers all boarded an airplane or ship and the hero simply carried them to their destination? Given their abilities, they could get the passengers to where they wanted to go faster than if traveling by plane. This would cut down on the use of fuel. The only modifications tha needed would be a way for passengers to withstand any supersonic speeds or turbulence that might occur.
What about all the heroes with super-brains? Why hasn't Reed Richards come up with a solution by now? He did have a plan to solve everything before. We know that Tony Stark is trying to produce a new energy source with his Stark Resilient company that would absolve the need for fossil fuels. His first step was to design a car that doesn't run on gasoline.
If you're thinking of saying that comics are just comics and reality doesn't have a role in them, I would argue with that. We have seen everyday and current events brought into comics, whether it's the tragedy of 9-11, wars in certain countries or even Lady GaGa references, we've seen the real world creep into comics. If the heroes truly want to be heroic, they should start looking at the bigger picture in trying to save the world (and making my flight from San Francisco to Chicago cheaper and faster).