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groar · 12-29-2008, 05:09 AM

The FE did improve at idle from 0.22GPH (Gallons Per Hour) to 0.19 (and even 0.14 with a warmer and dryer weather).

Tire pressure doesn't change the instantaneous consumption while the engine is idle when coasting in neutral.

I'm OK that placard will make coasting in neutral shorter than sidewall. Anyway right before my Xmas challenge [1] I verified the tires, they were at more than 3.0 bars (43 psi) and pumped them up to sidewall (3.5 bars = 51 psi).

I got the car at 60000km and I make a maintenance every 15000km, so this is the 5th for me. The calculated idle numbers were consistent until that last maintenance. I can't believe that such a simple change from 10w40 to 5w40 can improve the FE at idle for more than 10%.

Denis.

[1] more about it later, I'm working on the data. You can read comments in my last 2 tanks.

12-29-2008, 05:09 AM	#5 (permalink)
groar X-Frenchy: very Join Date: Jun 2008 Location: Toulouse, France Posts: 595 scenic - '01 renault scenic 90 day: 43.09 mpg (US) megane - '97 renault megane classic Diesel 90 day: 72.53 mpg (US) dennisius - '06 Toyota Prius Team Toyota 90 day: 69.27 mpg (US) Thanks: 9 Thanked 34 Times in 23 Posts	The FE did improve at idle from 0.22GPH (Gallons Per Hour) to 0.19 (and even 0.14 with a warmer and dryer weather). Tire pressure doesn't change the instantaneous consumption while the engine is idle when coasting in neutral. I'm OK that placard will make coasting in neutral shorter than sidewall. Anyway right before my Xmas challenge [1] I verified the tires, they were at more than 3.0 bars (43 psi) and pumped them up to sidewall (3.5 bars = 51 psi). I got the car at 60000km and I make a maintenance every 15000km, so this is the 5th for me. The calculated idle numbers were consistent until that last maintenance. I can't believe that such a simple change from 10w40 to 5w40 can improve the FE at idle for more than 10%. Denis. [1] more about it later, I'm working on the data. You can read comments in my last 2 tanks. __________________ Save money & CO2 at home : http://ecorenovator.org/ Created and managed by the creators of http://ecomodder.com/ --- Earth and health are priceless, so are kilotank and AT-PZEV Best Mégane tank: 1268.9mi @ 77.847 MPG(US) 2008/06-2011/10 saving: 5725.5 kg CO2 (5342.6+382.9) Diesel / Money: 42.17% = 2446.25€ = 3357.26$ --- megane : thread - kill switch.