Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - How does not using your vehicle increase MPG?

RedDevil · 07-15-2015, 08:33 AM

If I take my car to go shopping I will typically get 8 l/100 km or about 30 mpg over the 2 km or so. Cold start, slow speed, parking crawl etc.

My commute sees 3 times that economy.
I see my tank average FE drop every time I do something local.
Even though those trips to the shop are short and don't waste much fuel overall, they do add up.

So if weather/family allows I walk to the shops; less miles, better FE.

If it does not I take my car.
If I took my wife's car instead I'd improve on the average FE for her car as well as my own, but it would be a false gain as it still would use more fuel than mine does.
The FE for the two cars combined would be lower while each car apart would get better FE...!
This seems impossible, but is just the implication of putting more miles on the car with bad FE and less on the one with good FE.

07-15-2015, 08:33 AM	#3 (permalink)
RedDevil Master EcoWalker Join Date: Dec 2012 Location: Nieuwegein, the Netherlands Posts: 3,999 Red Devil - '11 Honda Insight Elegance Team Honda 90 day: 55.57 mpg (US) Thanks: 1,714 Thanked 2,248 Times in 1,456 Posts	If I take my car to go shopping I will typically get 8 l/100 km or about 30 mpg over the 2 km or so. Cold start, slow speed, parking crawl etc. My commute sees 3 times that economy. I see my tank average FE drop every time I do something local. Even though those trips to the shop are short and don't waste much fuel overall, they do add up. So if weather/family allows I walk to the shops; less miles, better FE. If it does not I take my car. If I took my wife's car instead I'd improve on the average FE for her car as well as my own, but it would be a false gain as it still would use more fuel than mine does. The FE for the two cars combined would be lower while each car apart would get better FE...! This seems impossible, but is just the implication of putting more miles on the car with bad FE and less on the one with good FE. __________________ 2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut. lifetime FE over 0.2 Gigameter or 0.13 Megamile. For confirmation go to people just like you. For education go to people unlike yourself.