My dad farmed for about 20 years and has told me numerous stories of deer coming in the field just to investigate, with 2 of the bucks being the largest he had ever seen. Something about the smell of diesel exhaust and the low RPM smooth running diesel doesn't bother them. I also have a friend who uses a kubota RTV diesel to get to the stand, drives through the middle of their food plots and still kill good deer every year. A gas 4 wheeler though, they run for the hills.