Despite also winning four stages last year, the 26-year-old German said he was surpassing his own expectations.
"Before the race I said my goal was to win one stage. I said last year it was unique to win four stages and wear the yellow jersey," Kittel said. "Yet again, it's a little similar this year.
"It's very unique and not something you can expect every time. I'm very happy it's working so well."
Elsewhere, the major news of the day was the crash that saw Froome hit the deck.
He will undergo an X-ray later on Tuesday as a precaution, his Sky team manager Dave Brailsford said.
Froome suffered grazing to his left thigh and elbow but it was his wrist that seemed to bother him most.
After a trip to the medical car, he came back with a splint on his left wrist and bandaging on his left thigh and right hand.
The other major news was the abandonment of former winner Andy Schleck with a knee injury.
The 29-year-old Luxemburger fell around 30km from the end of Monday's third stage but pulled out before the start of the fourth stage after tests showed he had damaged ligaments and the meniscus.
-AAP