I did giggle a little, while writing the 1st response, I did a $400 Hypertech power programmer on my 99 4x4 Dakota 5.2ltr Magnum with taller 32"x11"x16"" tire, with an $150 AEM air box, 4" intake tube, high swirl AEM TB spacer & gauze filter, $370 Harlan Sharpe 1.7:1 rockers, $150 3" cat back Flowmaster & I get an average of about 2.5mpg {15mpg average} better than stock tune {probably 12.5mpg at best}, combined city/hwy, on freeways driving it's almost 5mpg {17.5-20mpg average, depending if I stay under 70 or not}, but we don't have any freeways here in the sticks...LOL..., along with a bunch more "useable power/tq" for driving in the hills, here where I live, not sure how much actual power increase, maybe 10%-15% max overall, probably will make a little more improvement {like 10% more maybe}, with just the $250 Edelbrock Shorty tunned "chrome" headers, I still need to install... I did a similar combo on an old R/T Dakota 2wd 5.9ltr & made about 55 net rwbhp from all the additions... Improvements weren't cheap about $1000 for 5mpg & maybe 40-50HP
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Sorry, really "I didn't mean to sound insensitive"...LOL..