Well, I went again today and reached my goal! Lowered the tire pressure to 25psi and had about half a tank less of fuel. There was even quite some headwind (9 m/s) and still running on 91 octane so I guess I can go lower.
1) 2007 E92 Auto
2) Around sea level, 60°F but humidity unknown (but low)
3) JB+@100% and solinoid bypass
4) 91 octane (95 ron) and less than 1/4 of a tank
5) No reduction, even some stuff in the trunk
4) Style 189 on Michelin Pilot Sport @ 24psi.
5) My first car with an auto in 10 years (DTC completely off and launched in 2nd around 2000rpm)
And the results:
