Here's city driving while timing lights with equaled and raised tire pressure to 40psi from betwwn 28 to 35psi depending on tire, they're all 40psi now and I was able to average 7.6L/100km, not a huge gain but that's almost 1 US MPG more just by raising the tire pressure and making sure they're even all the around.
On the highway is where it really shined, giving me a nice 6.6L/100km which is something around 35 US MPG, maybe a little more, I did beat my goal but only just. I feel if there wasn't as much gas in the tank, and I didn't have to slow down for a deer, I could have pushed it closer to 36 or 37 US MPG but for a bone stock SUV, I feel 35MPG is good when all I did was equal out the tire pressure at 40psi and then fold the mirrors in on the highway while going exactly 90km/h in a 90km/h zone.
