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Dally seems angry as they drive back, and Johnny and Ponyboy think it's because he is annoyed they didn't turn themselves in earlier, if at all, to save him trouble. But he explains "in a pleading, high voice" that he just doesn't want Johnny to get hardened in jail. Ponyboy realizes how tenderly Dally feels for Johnny, and thinks about what Dally might have been like before he was toughened on the streets and in jail.
In this chapter, the side of Dally that was revealed was the one that cares about people, the kind one. He didn't let johnny turn himself in.
the book :)