I have a 2000 Chevy Metro 1.0 3cyl. I use an Apexi Safc air fuel mixture adjuster that works with the map & TPS sensors. Google Safc/Vafc, I find mine on ebay or craigs list.
I get anywhere from 50 to 62 mpg according to how I drive. I get 52mpg at 60-65mph have got over 70 mpg on shorter legs.
You can adjust fuel ratio lean for only low load under 3000rpm or any range that you want.
I have been running this on 3 of my cars for 10 months, 2000 metro, 1998 hx 51-62mpg, 2002 Acura RSX 34-38 mpg. If you set it lean on low load it will not hurt the engine. It actually runs cooler.
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