Davyboy - what kind of fuel consumption feedback do you have in your truck? Your garage entry says "custom".
MPGuino?
The reason I ask: mods to you driving style - via instant/average feedback - will net you the largest results, faster.
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Check this thread for a current discussion of many of the issues you're wondering about
:
http://ecomodder.com/forum/showthrea...ust-10328.html