Apparently a dusty track is scrambling the timesheets; look at the shifts from FP1 to FP2 (except for Lorenzo, who remains mired in the last half of the times)
FP1:
1. Andrea Dovizioso ITA Ducati Team (Desmosedici GP) 1m 43.684s [Lap 14/14] 323km/h (Top Speed)
2. Marc Marquez ESP Repsol Honda Team (RC213V) 1m 43.778s +0.094s [14/16] 314km/h
3. Yonny Hernandez COL Aspar MotoGP Team (Desmosedici GP14.2) 1m 44.027s +0.343s [16/16] 318km/h
4. Maverick Viñales ESP Team Suzuki Ecstar (GSX-RR) 1m 44.113s +0.429s [17/17] 317km/h
5. Aleix Espargaro ESP Team Suzuki Ecstar (GSX-RR) 1m 44.128s +0.444s [16/16] 313km/h
6. Valentino Rossi ITA Movistar Yamaha MotoGP (YZR-M1) 1m 44.181s +0.497s [13/13] 319km/h
7. Dani Pedrosa ESP Repsol Honda Team (RC213V) 1m 44.231s +0.547s [13/14] 315km/h
8. Jack Miller AUS Estrella Galicia 0,0 Marc VDS (RC213V) 1m 44.244s +0.560s [16/20] 310km/h
9. Bradley Smith GBR Monster Yamaha Tech 3 (YZR-M1) 1m 44.275s +0.591s [16/16] 316km/h
10. Scott Redding GBR Octo Pramac Yakhnich (Desmosedici GP15) 1m 44.293s +0.609s [18/19] 319km/h
11. Hector Barbera ESP Avintia Racing (Desmosedici GP14.2) 1m 44.455s +0.771s [17/17] 316km/h
12. Jorge Lorenzo ESP Movistar Yamaha MotoGP (YZR-M1) 1m 44.742s +1.058s [12/13] 316km/h
13. Loris Baz FRA Avintia Racing (Desmosedici GP14.2) 1m 45.080s +1.396s [18/18] 310km/h
14. Eugene Laverty IRL Aspar MotoGP Team (Desmosedici GP14.2) 1m 45.294s +1.610s [15/15] 311km/h
15. Alvaro Bautista ESP Factory Aprilia Gresini (RS-GP) 1m 45.447s +1.763s [17/17] 309km/h
16. Stefan Bradl GER Factory Aprilia Gresini (RS-GP) 1m 45.519s +1.835s [18/18] 307km/h
17. Pol Espargaro ESP Monster Yamaha Tech 3 (YZR-M1) 1m 45.590s +1.906s [18/18] 315km/h
18. Andrea Iannone ITA Ducati Team (Desmosedici GP) 1m 45.792s +2.108s [10/17] 326km/h
19. Tito Rabat ESP Estrella Galicia 0,0 Marc VDS (RC213V)* 1m 45.876s +2.192s [22/22] 310km/h
20. Cal Crutchlow GBR LCR Honda (RC213V) 1m 46.086s +2.402s [6/11] 310km/h
Read more at
http://www.crash.net/motogp/results/228912/1/motogp-argentina-free-practice-1-results.html#96U8qSvbXOQCl4Of.99FP2:
1. Marc Marquez ESP Repsol Honda Team (RC213V) 1m 41.579s [Lap 15/16] 317km/h (Top Speed)
2. Dani Pedrosa ESP Repsol Honda Team (RC213V) 1m 41.604s +0.025s [15/16] 315km/h
3. Maverick Viñales ESP Team Suzuki Ecstar (GSX-RR) 1m 42.047s +0.468s [11/15] 316km/h
4. Jack Miller AUS Estrella Galicia 0,0 Marc VDS (RC213V) 1m 42.375s +0.796s [14/17] 313km/h
5. Cal Crutchlow GBR LCR Honda (RC213V) 1m 42.451s +0.872s [17/18] 315km/h
6. Scott Redding GBR Octo Pramac Yakhnich (Desmosedici GP15) 1m 42.458s +0.879s [16/18] 318km/h
7. Valentino Rossi ITA Movistar Yamaha MotoGP (YZR-M1) 1m 42.565s +0.986s [18/19] 317km/h
8. Aleix Espargaro ESP Team Suzuki Ecstar (GSX-RR) 1m 42.576s +0.997s [12/12] 314km/h
9. Bradley Smith GBR Monster Yamaha Tech 3 (YZR-M1) 1m 42.595s +1.016s [17/18] 317km/h
10. Andrea Dovizioso ITA Ducati Team (Desmosedici GP) 1m 42.635s +1.056s [14/18] 323km/h
11. Hector Barbera ESP Avintia Racing (Desmosedici GP14.2) 1m 42.664s +1.085s [14/16] 319km/h
12. Eugene Laverty IRL Aspar MotoGP Team (Desmosedici GP14.2) 1m 42.724s +1.145s [14/14] 318km/h
13. Pol Espargaro ESP Monster Yamaha Tech 3 (YZR-M1) 1m 42.774s +1.195s [12/16] 317km/h
14. Jorge Lorenzo ESP Movistar Yamaha MotoGP (YZR-M1) 1m 42.819s +1.240s [10/14] 318km/h
15. Andrea Iannone ITA Ducati Team (Desmosedici GP) 1m 42.953s +1.374s [18/19] 325km/h
16. Loris Baz FRA Avintia Racing (Desmosedici GP14.2) 1m 43.054s +1.475s [17/18] 313km/h
17. Yonny Hernandez COL Aspar MotoGP Team (Desmosedici GP14.2) 1m 43.242s +1.663s [11/13] 319km/h
18. Tito Rabat ESP Estrella Galicia 0,0 Marc VDS (RC213V)* 1m 43.538s +1.959s [10/18] 312km/h
19. Alvaro Bautista ESP Factory Aprilia Gresini (RS-GP) 1m 43.800s +2.221s [18/18] 311km/h
20. Stefan Bradl GER Factory Aprilia Gresini (RS-GP) 1m 43.892s +2.313s [11/17] 308km/h
Read more at
http://www.crash.net/motogp/results/228930/1/motogp-argentina-free-practice-2-results.html#5jOEbpWSJStEkBCX.99