http://www.answerbag.com/profile/709408 New Answerbag answers from Anonymous Wed, 30 May 2012 05:21:30 -0700 Wed, 30 May 2012 05:21:30 -0700 http://www.answerbag.com/a_view/4770945 What is the average MPG for a semi tractor?<br /><br />An average per week of the 3 class 8 semi&#039;s I own, is anywhere from 6.3 to 7.6 depending on the route traveled. More mountainous the travel, the less fuel mileage you get. A good average for most trucks is 8 mpg. Tue, 02 Dec 2008 13:58:13 -0800 http://www.answerbag.com/a_view/4770945