TT5.9mag said

I think the increase has more to do with being able to dial in the tune up than anything else. I’ve never tuned a stock vehicle but I bet you could make some improvements in fuel mileage just with tuning. The manufacturers have to tune to a fairly wide margin of safety and have a huge window for environmental changes. I know a lot of the tuner “guys” advertise a fuel mileage tune if that’s what someone is after.
And I lied, it’s not 610k. As of right now it’s 612,380.
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mbaird said

A little bit of boost during part throttle driving should see better mpg due to the increase in cylinder pressure.

I am redoing a 93 Mazda B2600i 4x4 right now to use as a daily driver and am considering either an Eaton M60 or a small turbo for better mpg and more HP than the 129 it came with stock .

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