EDIT: Plus, you can't just cheat to get the Cuprino I think, it would still want you to do your mish, unless there's a console cheat to get past races or automatically win, I think you have to do it.
[Edited by Aeterna85, 10/7/2011 10:43:48 PM]
A good idea is to keep as close to the lead as you can using the boost in the right places for the first two laps, then use all of the weapons on the last lap to keep the lead.
Using the boost at the right time is also essential. Use your boost on the longer straight(ish) parts, and the sections with long curves.
Lastly, choose the right path. There's a few sections where you get the option of two paths. On these you want to pick the ones which take you further out. These tend to be the long curves I mentioned in the last paragraph. It's easy to control the car while boosting on these parts, and can often get you the lead.
Oh, and also go out for a drive and destroy bandit cars. You'll get racing certificates from Sally as well as money. You can then use these to upgrade your car. Do all of the time trials you can too (I don't know if there's more than the one you must do as part of the story though).
I'm with you in that I hate driving games and won't be doing any of the races other than the time trial and this race to win the Caprino, plus I have RSI so my reaction speed isn't what it used to be, but I managed to win the race first time around (just barely, but a win is a win), so don't give up. It's as much about your strategy as it is about your skill at driving.