Thanks for that link s2man...
Wow! holy freakin' confusing batman! There's some offroad tires with lower RR than touring radials. There's some manufacturers where the 70 profile does better than the 65, then there's some where the 65 does better than the 70 or 75. Looks like a crapshoot, you might hear that a particular tire has a LRR but in the tire size you need, something different might do better!
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice