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The SPF user manual says 18 psi (cold) for normal driving and 25 psi for performance driving. No mention on tire type.
I do not have Billboards, just regular Goodboot tires. I find that 19 PSI in all tires is the best mix for traction and ride quality for me. The tires act like shock absorbers, so the lower pressure gives a much better ride around town. With 25 PSI around town, the ride is rough and the car wants to skip around on rough surfaces.
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Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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