Well, bro 'n I went to Bathurst for the V8Supercars, then I ran him up to Coolangatta. The 60series tyres were on the back going up, but we went to Armidale via the flat inland road with a tailwind, so the trip up was 1000km at 6.8L/100. It was a little squirmy in the rear, but I wasn't sure if it was lack of grip or bump steer from more sticky tyres, certainly I expected the 60series to be better than the 70series.
We swapped the wheels to big ones on the back and small ones on the front up there, and I went back to Armidale to fetch The Girl from Uni. This was a climb up through the twisties from sea level to a few thousand feet, and then we had a headwind back to Orange. The big tyres on the back dropped the revs, but turned in 7.7L/100km, all on United 95octane.
The worst thing was the tyres! The 60series have worse grip than the 70's, so Maxxis are just not as good as cheap Falkens. The increase in understeer was quite noticeable. Still, they'll do while I decide what diff to use, 13" or 14" rims, which tyres to buy.