Quote:
Originally Posted by Old Mechanic
Above 80% the ecu enrichens the mixture for more power and mpg suffers due to enrichment.
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That doesn't seem to be the case with my '07 Mustang. Accelerating on the freeway on-ramp leaving work, I regularly hit 100% load on my UltraGauge without going into open-loop. Shifting @ 2500 RPM, I'm getting 6-8 MPG in 3rd, 8-10 MPG in 4th, and 13-15 MPG in 5th while accelerating to 65 MPH. YMMV.