Reducing tyre size will give higher RPM at 100 KPH not lower.
From heaps of surfing over the yank sites... 1700 to 1800 ish is about where they get their best fuel economy.
BenK... where did you source your 10% gearing from?
Last week I was talking to two blokes here in Perth, one with the 4L85 and one with a beefed up 4L80 and both reckon best thing ever.
If thats the go then a 6L80 should be goddam awesome as 1st is waaay lower and 6th is even higher overdriven ratio than the 4L80/5's
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