This past March, my Dodge Magnum decided to shred apart its 4-speed automatic transmission. Shortly afterward, I decided to swap the 4-speed out for a 6-speed NSG370 transmission. I placed the Magnum back on the road with the new transmission this past October, and start gathering fuel consumption data for it in November.
2015 (with 6-speed NSG370)
| Date | Odometer (mi) | Fuel (gal) | FE (US) | FE (L/100) |
| 11/09/2015 19:56 | 350.6 | 15.443 | 22.7 | 10.4 |
| 11/20/2015 16:39 | 353.6 | 14.455 | 24.4 | 9.6 |
| 12/07/2015 08:04 | 364.9 | 15.719 | 23.2 | 10.1 |
| 12/17/2015 19:35 | 380.1 | 15.479 | 24.6 | 9.6 |
| Total: | 1449.2 | 61.096 | 23.7 | 9.9 |
2014 (with 4-speed 42RLE)
| Date | Odometer (mi) | Fuel (gal) | FE (US) | FE (L/100) |
| 11/10/2014 00:00 | 342.2 | 15.122 | 22.6 | 10.4 |
| 11/20/2014 18:48 | 277.9 | 13.470 | 20.6 | 11.4 |
| 12/05/2014 17:14 | 284.0 | 14.154 | 20.1 | 11.7 |
| 12/15/2014 18:26 | 313.8 | 14.501 | 21.6 | 10.9 |
| Total: | 1217.9 | 57.247 | 21.3 | 11.1 |
Note: I also changed the rear end from 3.636 to 2.87, in order to compensate for the top gear change from 0.69 (42RLE, 4th) to 0.84 (NSG370, 6th). However, the resultant decrease in engine speed from this swap (about 3.9%) cannot account for the 10.1% decrease in fuel consumption.