Search for Tire pressure on this site. Yes it does make a difference, but the results vary.
Take a relatively heavy car with relatively narrow / small wheels then you will benefit the most.
I estimate raising my pressure from 2.4 bar to about 3 bar (34 to 42 psi) gave me a 5 to 10% increase in mileage and better cornering.
+1 on the instrumentation. Having an OBD2 tool like UltraGauge or ScanGauge gives that much more insight in what's happening, and setting alarm levels for parameters you don't want to show all the time but don't want to reach certain levels is essential when modding in earnest, like my 90% grill block.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
Last edited by RedDevil; 11-15-2013 at 04:37 PM..
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