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I had my pcm tuned by Blackbear, but this wasn’t specifically an eco tune. tune was also needed to enable pcm controlled cooling fans. I hadn’t wanted to put a grill block in front of a fan clutch either. So within a couple tanks I added a 91 octane tune, partial grill block, swapped mechanical to electric fans, and I’m guessing I picked up .25 - .5 mpg with mixed, or more in town driving. I’m wondering if I might have picked up a bit more highway, but haven’t had a good comparison yet. I don’t use the vehicle to commute, so comparing tanks is tricky.
Picked up some power, guessing at least a sliver of efficiency from the tune alone, enabled the fans. But there was a happy surprise, maybe it’s just how I drive it, but the biggest thing I noticed from the tune was drivability improvements. Feels like they replaced my lazy old transmission with one that is almost psychic.
I think a lot of people’s first mod is some sort of grill block. Which should be possible for most conditions. My next thought is an airdam, but that would be dependent on your off-roading.
On my old 91 K1500 I figured up the fuel I saved slowing down worked out to about $5 saved per hour lost
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