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Old 04-18-2020, 11:03 PM   #1
Lightfoot2002
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Default And the rate of return is.......

NEGATIVE. With our country being invaded as a result from the behavior of a foreign power for the first time since the War of 1812, I took the opportunity to see if I could exploit the MPG situation to my advantage. Since I am considered an essential employee, I am able to continue working as usual. Therefore I commuted every day to my job in my 2002 Saturn SC2 under ideal conditions for my MPG experiment. With virtually no other traffic on the road, I drove the Saturn in 5th gear without my foot on the accelerator. The car maintained 25-30 MPH. I was hoping for a 45-50 MPG. I was disappointed. I got 38 MPG. Now it took more time to get to my destinations of course. It wasn't worth the effort or risk. So now I drive faster in all gears. Normal driving now of course. Besides, regular gas is below 2 bucks a gallon in my area.
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Old 04-19-2020, 08:49 AM   #2
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Default Re: And the rate of return is.......

Fuel efficiency might improve if you drive a little faster.
Try keeping the engine R.P.M. at a specific point on the map and see what happens. The graphs don’t account for the car’s wind resistance.









About the graphs:
Many moons ago, the graphs were posted by someone on this website. I printed, marked-up and re-posted them while I was trying to decide if I wanted to do a 5th Gear Swap. ...and to ask others if I understood the graphs.
...
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Old 04-19-2020, 09:06 AM   #3
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Default Re: And the rate of return is.......

Correction: ...The graphs don’t account for the car’s wind resistance, except maybe in the “% load”.
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Old 04-19-2020, 11:22 AM   #4
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Default Re: And the rate of return is.......

The sweet spot for optimum gas mileage is a funny thing.... I had three Triumph Adventurers -3 cylinder watercooled carburated... One had lower gearing - and turned almost 1000 rpm more at 60 mph - but got 10 mpg better gas mileage than the other two higher geared bikes....


Retry your experiment in 4th gear....
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Old 04-19-2020, 02:23 PM   #5
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Default Re: And the rate of return is.......

My 1981 Suzuki GN400 was pretty much a 60 MPG bike. Then I had to do maintenance on my FJ1200 so had to ride the little 1 cylinder bike everywhere, including the highway. On the highway I'd hold it wide open and take the speed I got, 55-70 depending on the winds and hills. Started pulling down in excess of 70 MPG.

I think the S Series is optimized for 55-60 mph.
...
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Old 04-19-2020, 04:01 PM   #6
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Default Re: And the rate of return is.......

Quote:
Originally Posted by Waiex191 View Post
My 1981 Suzuki GN400 was pretty much a 60 MPG bike. Then I had to do maintenance on my FJ1200 so had to ride the little 1 cylinder bike everywhere, including the highway. On the highway I'd hold it wide open and take the speed I got, 55-70 depending on the winds and hills. Started pulling down in excess of 70 MPG.

I think the S Series is optimized for 55-60 mph.
Sounds about right... Best I ever got (95 SC2) was a trip almost to the UP and back - managed to fill up before I left on each end of the trip. Maintained a dead steady 55 mph on overinflated tires (45 psi) and squeaked out 43 mpg...
...
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Old 04-19-2020, 11:04 PM   #7
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Default Re: And the rate of return is.......

Quote:
Originally Posted by Waiex191 View Post
I think the S Series is optimized for 55-60 mph.
I think you're right as well. On recent trips down to Sat Catharines, the traffic's been a lot lighter, but my right foot's been a lot heavier and I've found myself cruising at about 75-80 mph. Subsequently, my mileage has taken a hit and where I used to average 34-39 mpg, I'm lucky to break 30 mpg now.

There are other factors at play such as more short city trips mixed in but as they say, YOUR MILEAGE MAY VARY.
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Old 04-20-2020, 08:50 AM   #8
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Default Re: And the rate of return is.......

Quote:
Originally Posted by Lightfoot2002 View Post
NEGATIVE. With our country being invaded as a result from the behavior of a foreign power for the first time since the War of 1812, ...
China with the assistance of the worldwide elites including many dim witted entertainers and basketball players.
...
• 1997 SW2 used 12/29/2011 with 124,200 -27 mpg
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Old 04-20-2020, 03:03 PM   #9
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Default Re: And the rate of return is.......

The national speed limit until 1995 was 55mph. It would only make since that the S-Series would have been designed to be the most efficient at 55.

I don't remember where I read this before, or if I'm even remembering correctly, but 2500rpm is about peak efficient for the DOHC. (about 63mph in my twin cam auto) Lately though I've noticed that the engine and overall ride seems a lot smoother driving at 70mph, or about 2800rpm. (or maybe it's 3000, been a while since I've been on the highway) I don't do nearly enough highway driving to test fuel economy at 65 vs 70, but it doesn't seem that different in my mixed testing.

The best I've ever gotten was 40mpg, but the whole tank wasn't 40 mpg. I filled up, drove for about 100 miles, filled up again and checked. Was pretty surprised to see that considering that there was some traffic, few miles of A/C usage, and one time when I got up to 85 trying to get a better look at a Porsche, lol.
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Old 04-20-2020, 03:47 PM   #10
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Default Re: And the rate of return is.......

Usually the peak torque of an engine is where its efficiency is also at a peak.
Here is an S Series HP-torque chart:


Found at this old post:
http://www.saturnfans.com/forums/sho...27&postcount=2

The total efficiency is a combination of the whole system, but the motor is a good place to start.
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Old 04-20-2020, 03:48 PM   #11
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Default Re: And the rate of return is.......

In the April 2, 1987, Surface Transportation and Uniform Relocation Assistance Act, Congress permitted states to raise speed limits to 65 mph (105 km/h) on rural Interstate highways.

EDIT: there is some debate on this issue, and perhaps Zeebins 1995 date is correct, as that's when Congress did a full repeal of the Nixon/Ford Law.

Last edited by toggenburg; 04-20-2020 at 03:53 PM.
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Old 04-20-2020, 05:57 PM   #12
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Default Re: And the rate of return is.......

Quote:
Originally Posted by Zeebins View Post
...driving at 70mph, or about 2800rpm. (or maybe it's 3000, been a while since I've been on the highway
2800 is 70mph, and 75 is about 3000rpm..... up until Covid-19, I was driving that daily 100 miles.

Quote:
The best I've ever gotten was 40mpg
The best I've gotten is 35, and then several months ago I suddenly started struggling to get 30mpg. A lot of times it's only 28mpg and that's about 98% highway driving. It seemed like too big a drop to be winter gas, but maybe. The thermostat needed to be replaced, so I did that, but it didn't help the mileage. I've now taken care of the EGR, but haven't had the chance to check mileage again. I did have an O2 code pending the other day, but I thought maybe it was due to the EGR problem I had.
...
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