I tried it out, and while it is definitely much harder than before, it is still very much possible. Had to pull out every trick I knew to get Gold though.
There are two things that are very important: the revs, and the speed. Try to keep your revs at around 1000 rpm (you have to use manual mode, I'm afraid) and never go above 1500 rpm. Your speed should be above 30 km/h, in general. Going lower than that will require you to burn more fuel, so you have to try to maintain a good speed throughout the run.
Third gear is your best friend here to maintain a constant speed above 30, besides going into a higher gear to let the car roll or on some other sections. Also, be smooth with your steering.
Here's my run. There's probably a more efficient way, and I did make a couple of mistakes, but it will do.
Quite harder now, after 1.71, so I definitely don't blame you if you use an exploit to just get it done.