Compare the distinct exhaust sound of the BMW Z4M E85 with a 3.2L naturally aspirated engine and the BMW Z4 35i E89 with a ...

Start drawing Venn circles around ‘21st century M cars’, ‘affordable’ and ‘not a hulking SUV’ and the Z4M is the only car left in the shade. For that reason alone it has to be a winner.

The plan is to have the Z4 pushing 700hp on E85. Of course, we’ll update you as the project progresses. See All 4 Photos 242.5mph S4 ...

E85 also is not sold at every gas station, and depending on where you are, could be difficult to find. Still, advocates of the alternative fuel say that price isn't the only reason to use the fuel.

Last week at the 1st Stop Conoco at Hampden Avenue and Chambers Road in Aurora, E85 was priced at $2.999, and regular unleaded at $3.599. That’s a 60-cent difference, or 17 percent cheaper for E85.

This video compares the exhaust sound of the BMW Z4M E85 with a 3.2L naturally aspirated engine and the BMW Z4 35i E89 with a 3.0L turbocharged engine. Revving clips, idle tones, and throttle response ...