Whittingham's hot form has been one of the reasons Dave Jones' men have started the season so well - he's scored twice in four games so far.
He said: "For the team things couldn't be going much better at the moment. We are playing well and a lot of what we are trying is coming off. We've got off to an unbelievable start.
"The end of last season was heartbreaking but we have learned from it and are determined to do a better job. We are looking forward to the challenge of the derby and it is going to be a massive game."
Whittingham's own form dipped towards the end of last season as City fell out of the play-off picture but he now believes he is in some of the best form of his career to date.
He added: "I'm happy with how things are going and I'm playing a lot better. I just want to carry on and score goals. Two goals in four games - I'll take that, any midfielder would."
Meanwhile, Gary Johnson's sixth-placed Robins are also banking on an in-form goalscorer to continue their fine run with Nicky Maynard having fired consecutive winners over Crystal Palace and QPR.
After a slow start to his Ashton Gate career, Maynard, who cost the club a record £2.25million last year, is finally hitting top form and has set himself an ambitious target of 20 league goals this season.
Maynard said: "My aim is to get 20-plus goals this season, definitely. Hopefully I won't think about it too much and the goals will start flowing. I'm setting my sights high this time.
"It was nice to get off the mark at Brentford and I was pleased with the goals I scored against Palace and QPR. It's even better when they are winning goals. I believe in myself and the way the team is playing."