The technology must be pretty old on that engine. You can get better milage out of a lot of diesel cars. I think that for the short term, diesel cars are a great idea. I truly wish that Japan and Europe car makes would bring more of their smaller diesels to market here in North America. Diesel bikes? Well, there are quite a few people in Europe that have done their own conversions with more modern small 500-800cc diesel engines and they are getting well over 100 MPG. Some reports I have seen, have them getting close to 150MPG on bikes that could be a replacement for big touring rigs.