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Old 05-23-2011, 12:50 AM   #27 (permalink)
womprat
Lead-footed Econewbie
 
Join Date: Apr 2009
Location: Wellington, New Zealand
Posts: 52

Ceffy - '97 Nissan Cefiro 25 excimo
90 day: 25.21 mpg (US)

Demio - '07 Mazda Demio Sport
90 day: 30.99 mpg (US)
Thanks: 4
Thanked 5 Times in 2 Posts
I'm considering going one size up in diameter tyre AND compesnating for ride height increase (aero). Where I live I can go up 5% in rolling diameter without having to have low volume certification for the mods.

I suspect this may work to reduce MPGs because I have an automatic, bascially it means the road speed of all shift points are raised.

So thats the question, should an automatic get some gains in a taller final drive outside of TC overdrive lockup?
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