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Old 09-17-2010, 02:12 PM   #13 (permalink)
yepvegas
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Join Date: Sep 2010
Location: Colorado
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I ran those speeds to answer the question someone had for me. I ran the tire caculation and this is what I came up with.

Stock Tire - 205/50R17 >Search Tires Tire 1 - 225/55R17 >Search Tires
Section Width: 8.07 in 205 mm
Section Width: 8.85 in 225 mm

Rim Diameter: 17 in 431.8 mm
Rim Diameter: 17 in 431.8 mm

Rim Width Range: 5.5 - 7.5 in
Rim Width Range: 6 - 8 in

Overall Diameter: 25.07 in 636.77 mm
Overall Diameter: 26.74 in 679.19 mm

Sidewall Height: 4.03 in 102.36 mm
Sidewall Height: 4.87 in 123.69 mm

Radius: 12.53 in 318.26 mm
Radius: 13.37 in 339.59 mm

Circumference: 78.75 in 2000.2 mm
Circumference: 84.00 in 2133.6 mm

Revs per Mile: 829.6
Revs per Mile: 777.8

Actual Speed: 60 mph 100 km/h
Speedometer1: 56.2 mph 93.7 km/h

Speedometer Difference: - Speedometer Difference: 6.659% too slow
Diameter Difference: - Diameter Difference: 6.25%
If I could drive 60 the entire way to work that would be great but 18 miles of my trip is in a 75 zone, so unless I can trail a semi that is going that slow I have to go at least 65.

The rest of the drive is in a 65 zone so it is easier to keep the speeds down, it is also a good deal of stop and go traffice getting into downtown Denver, so the speeds are usually pretty slow. We have a hour glass freeway 5 lanes to 3 lanes to 5 lanes again so the traffic backs up and then flows ok to bottleneck again. We could all save alot of fuel consumption if the roads were better designed.

I have no problem with driving slower and saving gas. But on the weekends going up to the mountains, I will drive for the enjoyment of it and not for fuel economy. I can alway coast most of the way home coming back to recoupe the fun I had on the mountain roads. I am not trying to save the world, I just want to save some money so I have more funds for toys in the car. My next project is a car PC, that will make it nice for monitoring the car. I will be installing a second monitor to replace the insrument cluster to monitor all of the stats of the car.

Right now i am looking into how I want to do the grill block upper and lower. I think I will block the lower opening completely and block the middle of the upper one leaving a 1 inch opening around the outside so the engine can still bring in fresh air to keep it cool and whatch the temps closely after that. I think all that is left to do is my method of exicution.

Good news my dash is reading an an average of 40.2mpg I think it could be better but the last coulple of days the traffic has been really bad. I still need to adjust the air pressure in the tires maybe I will get to that this weekend, not sure how much of a differnce to expect from the tires. Is there a limit or recomendation as to what is safe?

Thanks again for all the suggestions and support.
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