Quote:
Originally Posted by MetroMPG
If I recally, in my typical usage (mainly secondary highway driving on very lean-burn friendly routes with extensive aero mods), it was more like a ~33% increase, from ~75 mpg to ~100+ mpg.
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I find I'm still able to cruise at ~85mpg where I would be getting 90-100mpg with lean burn enabled, but I'm sure the delta would be larger, the larger the percent of cruising on level ground. I may do further testing though.