tuner or module
I know it is not "tuner related" but here is the standard "mpg stuff":
<TABLE style="WIDTH: 629pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=839 border=0 x:str><COLGROUP><COL style="WIDTH: 629pt; mso-width-source: userset; mso-width-alt: 30683" width=839><TBODY><TR style="HEIGHT: 13.5pt" height=18><TD class=xl25 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 13.5pt; BACKGROUND-COLOR: transparent" width=839 height=18>Ten Areas that helped me:</TD></TR><TR style="HEIGHT: 15pt; mso-height-source: userset" height=20><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15pt; BACKGROUND-COLOR: transparent" width=839 height=20>#1 - (NO DOUBT) - driving style, habits, highway speed, slow take-offs, coasting and/or anticipating stops, etc. (AND SLOW DOWN!!)</TD></TR><TR style="HEIGHT: 15pt; mso-height-source: userset" height=20><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15pt; BACKGROUND-COLOR: transparent" width=839 height=20>#2 - MINIMIZE IDLING (I still do 30 seconds to a minute on VERY cold mornings and days - but NO MORE). This helps in a lot of areas!</TD></TR><TR style="HEIGHT: 15pt; mso-height-source: userset" height=20><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15pt; BACKGROUND-COLOR: transparent" width=839 height=20>#3 - tire pressure - maximize it to the safe maximum pressure. Maintain tires in good condition. Some tires may even be better at mpg than others.</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=839 height=17>#4 - I got the most recent flash - I LOVE it! I think it adds .5 mpg at least.</TD></TR><TR style="HEIGHT: 14.25pt; mso-height-source: userset" height=19><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 14.25pt; BACKGROUND-COLOR: transparent" width=839 height=19>#5 - minimize your AC usage, but do NOT open all windows due to increased drag. On the highway, this can help up to 0.5 mpg.</TD></TR><TR style="HEIGHT: 12.75pt; mso-height-source: userset" height=17><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=839 height=17>#6 - fuel additives (MY OPINION HERE, some feel differently). Use one that is a water demulsifier and does not contain alcohol.</TD></TR><TR style="HEIGHT: 12.75pt; mso-height-source: userset" height=17><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=839 height=17>#7 - If you still have it, clean your EGR valve every 30,000 miles. Not sure how much it helps, but I am confident it does.</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>#8 - synthetic oil (change on time) - may help a few tenths to .5 mpg (0.5 is probably optimistic).</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=839 height=17>#9 - I was recently talked into a power elbow - maybe makes a tenth or two tenths mpg improvement (but I like it).</TD></TR><TR style="HEIGHT: 12.75pt; mso-height-source: userset" height=17><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=839 height=17>#10 - Check regularly for boost air leaks and check the filter minder to ensure you are not driving w/ a restricted air filter.</TD></TR><TR style="HEIGHT: 13.5pt" height=18><TD class=xl25 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: windowtext 1pt solid; HEIGHT: 13.5pt; BACKGROUND-COLOR: transparent" width=839 height=18>Things that others have said will help (that I have not directly experienced):</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=839 height=17>#1 - Optimize your differential gearing to fit your truck and your service- definite help</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=839 height=17>#2 - Smaller, lighter, narrower tires - definite help</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=839 height=17>#3 - Tonneau cover - most say it helps by up to 0.5 mpg</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=839 height=17>#4 - tuner - probably will help - if you can still drive sensibly - takes willpower!</TD></TR><TR style="HEIGHT: 27pt; mso-height-source: userset" height=36><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 27pt; BACKGROUND-COLOR: transparent" width=839 height=36>#5 - open up the exhaust - probably will help VERY LITTLE and is a "high dollar per improvement gained" mod in my opinion.
The real reason for the exhaust mod is to lower EGT's.</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 629pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=839 height=17>#6 - Zoodad - probably not much help, but easy (I have done it and saw no difference).</TD></TR></TBODY></TABLE>










