View Single Post
Old 12-11-2007, 08:00 PM   #5 (permalink)
EcoModding Apprentice
Join Date: Dec 2007
Location: Melbourne
Posts: 152

The Mighty Mira - '92 Daihatsu Mira
90 day: 61.32 mpg (US)
Thanks: 0
Thanked 7 Times in 7 Posts
Lazarus: I just remembered that auto trans losses are about 8% (from memory). If you have a torque lockup converter this complicates things, because the TLC has nearly no losses.

I'm not sure whether the auto in neutral is comparable to the manual in neutral, so I don't know what the difference is (if any) in the glide phase. Again, check whether this will wear out your trans, in some cars it can.

However, most autos these days have a lockup converter, which means that at cruising and near cruising loads, the lockup converter will engage eliminating the 8% losses. Whether you can accelerate at 62% of BMEP or not is another thing. However, Even given these 8% losses, you might still be better off P&Ging. You'd have to calculate your constant velocity fuel economy and compare.

But glad things are working out for you.
"Every body perseveres in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by force impressed." - Isaac Newton
  Reply With Quote