So, bullets and fuel are two areas where this effort towards commonality goes, so that all military vehicles in NATO are supposed to operate on Diesel (a standard fuel, much as 5.56 is standard ammunition) within a specified period.

Toward that end, a company has developed diesel fueled motorcyles, based on the Kawasaki KLR650, a robust yet simply designed single cylinder motorcycle intended as a dual purpose bike.
The USMC put a contract out requiring diesel and a company stepped forward and created it. The thing is a workhorse. Travels up to 90mph (not too fast, but it probably chugs forever) and the kicker? It gets 96 MPG. A future civilan variant is supposed to get 110 MPG.
Damned impressive and I'm looking forward to these being on the market.
http://www.eurekalert.org/pub_releases/ ... 110304.php
http://www.vvdailypress.com/2001-2003/1 ... 44870.html
http://www.kawasaki.ca/dual/KLR650/
http://www.m1030.com/
http://www.f1engineering.com/projectpics%20white.html