Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Aero & rolling resistance, power & MPG calculator

aerostealth · 05-04-2015, 01:54 PM

Does anyone know anything about the MPG calculator in the Garage & Tools section? I have been playing with it and I am finding there are at least three variables that are hard to know or pin down. They are rolling resistance, engine efficiency, and parasitic load.

I have been making informed guesses and I can generate some pretty interesting numbers by doing so but as to are they are true or not I can not say.
I would invite more of you to try the calculator out and let me know what you think. I will give you an example of the values I tried on my truck to plug in so you can see for yourself. The results matched observed mpg numbers in many instances.

Ford F-150 XLT 4x4 with a EcoBoost Engine and a 6.5 ft bed.

Weight 6070
Rolling Resistance 0.014
Cd 0.34
Frontal Area 36 sq ft
Engine Efficiency 32%
Drive train .893
Parasitic load 500 watts
Air Density set to 77 F
Display Range 5 to 200 in 5 mph increments.

I produces a calculator set for the Phil Knox's truck but I do not have good specs for it so I won't share that for now. Let me know what you think and if you have better values for the three most questionable parameters i would like to hear of them.

05-04-2015, 01:54 PM	#1 (permalink)
aerostealth Master EcoModder Join Date: Dec 2014 Location: Radium Springs, NM Posts: 465 Ford XLT Naked - '14 Ford F-150 XLT 90 day: 15.04 mpg (US) Ford G-4 with Stinger - '14 Ford F-150 4X4 Super Crew XLT 90 day: 19.8 mpg (US) Ford Stealth G-4 - '14 Ford F-150 4X4 Super Crew XLT 90 day: 15.9 mpg (US) XLT Towing Keystone 5th wheel trailer - '14 Ford Keystone 5th Wheel XLT 90 day: 9.03 mpg (US) Trip 2015 C Max Energi - '15 Ford C Max Energi SWP 90 day: 38.2 mpg (US) Local 120 volt 2015 C-Max Energi - '15 Ford C-Max Energy SEL 90 day: 55.65 mpg (US) Local 240 volt 2015 C-Max Energi - '15 Ford C Max Energi SLE 90 day: 57.63 mpg (US) Energi Combined - '15 C Max Energi Leather 90 day: 51.2 mpg (US) MoonDust for Travel - '19 Chevrolet Bolt LT 90 day: 123.11 mpg (US) MoonDust 3 with 90% CE - '19 Chevy Bolt LT 90 day: 127.57 mpg (US) Ecopia IV - '19 Chevy Bolt Lt 90 day: 126.39 mpg (US) Ecopia IV Trip Log - '19 Chevy Bolt LT 90 day: 121.01 mpg (US) Rate Rider Chevy Bolt - '19 Chevrolet Bolt LT-2 90 day: 123.16 mpg (US) Teal Force One 70% - '24 Hyundai Ioniq 5 SEL 90 day: 98.52 mpg (US) Teal Force Two 90% - '24 Hyundai Ioniq 5 SEL 90 day: 119.12 mpg (US) Thanks: 2 Thanked 528 Times in 278 Posts	Aero & rolling resistance, power & MPG calculator Does anyone know anything about the MPG calculator in the Garage & Tools section? I have been playing with it and I am finding there are at least three variables that are hard to know or pin down. They are rolling resistance, engine efficiency, and parasitic load. I have been making informed guesses and I can generate some pretty interesting numbers by doing so but as to are they are true or not I can not say. I would invite more of you to try the calculator out and let me know what you think. I will give you an example of the values I tried on my truck to plug in so you can see for yourself. The results matched observed mpg numbers in many instances. Ford F-150 XLT 4x4 with a EcoBoost Engine and a 6.5 ft bed. Weight 6070 Rolling Resistance 0.014 Cd 0.34 Frontal Area 36 sq ft Engine Efficiency 32% Drive train .893 Parasitic load 500 watts Air Density set to 77 F Display Range 5 to 200 in 5 mph increments. I produces a calculator set for the Phil Knox's truck but I do not have good specs for it so I won't share that for now. Let me know what you think and if you have better values for the three most questionable parameters i would like to hear of them. __________________ Last edited by aerostealth; 05-05-2015 at 02:36 PM..