Driving 55mph? (Is it the most efficient speed?)

[tasdrouille]

I would LOVE to get my hands on the BSFC graph for my engine, but it looks like OEMs don't publish those anymore. That would really help me figure out what I need to do in less than a couple of tanks, until I get an SG.

I'm pretty sure I get better mileage at 3000 rpm than 1500. I know for sure that on the highway I get better mileage at 75 than 65.

[RH77]

The automatic and momentum seems to hit the sweet spot around 45-50 (with gentle/rolling hills). What I have noticed is that 60 mph preserves momentum on long uphills before the ECU dumps more fuel to compensate -- depends on the grade percentage...

RH77

[Big Dave]

Thanks to getting caught in the worst blizzard around here in thirty years last Friday, I had to drive about 50 miles at my best spot - 1000 RPM in top (0.73:1 overdrive) gear. As a result of that segment I had an exemplary tank MPG. 2 MPG over normal winter mileage.

Tas:
It is good living a few years in the town where your engine was built. If you know the right guys...

[Chris D.]

Ice?

[MetroMPG]

ICE = internal combustion engine

[Chris D.]

Originally Posted by MetroMPG

ICE = internal combustion engine

oh, ok.. I was like, why are they talking about that on here of all places..

In the performance community that stands for Intake, Cams and Exhaust

[jwxr7]

I think we need a "BSFC Topo Map Collection" sticky. It would be a cool way to compare engine behavior. There could be little "X marks the gold" spots on it for MPG, .

That would be cool.

[cfg83]

jwxr7 -

Originally Posted by jwxr7

That would be cool.

Here's one for my Saturn (Page 10), but the resolution is a little "fuzzy" (ha ha) :

Fuzzy Pareto Frontiers in Multidisciplinary System Architecture Analysis
http://web.mit.edu/deweck/www/PDF_ar...-2004-4553.pdf

CarloSW2

[jwxr7]

neat . I'm trying to find one for my engine.

[tasdrouille]

There's a real fuzzy one in there for the 1.0 GEO SI engine