I bought the RSE power steps and have been very happy with them. I have the Mopar 2 inch lift and 35's. The steps automatically deploy and retract and are lit to help when it is dark. They were a little pricey but they have been a great investment. When they retract they are out of the way for...
This being your first Jeep, spend some time and just enjoy it as it is. I am sure your MPG will improve with time. Try a little off-road activity so you can learn how to shift it into 4wd and try to find a local club or buddy to go wheelin with. Wear out those new tires before buying bigger ones...