Travelling Without Moving - Jamiroquai
Talk The Talk - Mr Mister
Havona - Jaco Pastorius Big Band
Lido Shuffle - Boz Scaggs
I'd Like To Thank You Jesus - Bryan Duncan
Givin it up for Your Love - Delbert McClinton
Rockin Down the Highway - Doobie Brothers
Long Road Out Of Eden (the whole album) - Eagles
The Heat is On - Glenn Frey
What You Need - INXS
Rock & Roll - Led Zeppelin
Won't Go Home Without You - Maroon 5
Curves Ahead - The Rippingtons

 

I'm in the "my mp3 player has 90 of my music collection and I pick based on mood-weather-etc." club, but here's the track list I used for testing the sound system in the mini:

The Cinematic Orchestra - Every Day - Everyday
Massive Attack - Blue Lines - Be Thankful For What You Got
Radio Citizen - Berlin Serengeti - The Hop (feat. Bajka)
Demania (de Grassi-Manring-Garcia Trio) - Demania - Paint It Black
Gomez - How We Operate - How We Operate
Beulah - The Coast Is Never Clear - A Good Man Is Easy To Kill
Lemongrass - Ikebana - Revolving door
Bonobo - Days To Come - On Your Marks
dZihan And Kamien - Gran Riserva - Where's Johny Sabatino
Koop - Waltz for Koop - Modal Mile
Seks Bomba - Operation B.O.M.B.A - Do You Know the Way to San Jose
Primus - Sailing the Seas of Cheese - Jerry Was a Race Car Driver
Cake - Comfort Eagle - Long Line of Cars
Maserati - Inventions For The New Season - Show Me The Season
Mark Knopfler - Sailing to Philadelphia - Speedway At Nazareth

So my summary would be:
Best genre for driving if there were no speed limits, Latin jazz.
Best genre for driving at night, downtempo jazzy electronic.