EOC vs. neutral with engine on

[BHarvey]

Originally Posted by twelvevoltman

I was figuring about half of the fuel usage at .1 gallons per hour. My car is a 4 cyl. 5 speed that idles at 650 rpm, so I would have to coast 606 times to save 1 gallon. It just doesn't seem worth it, especially on the shorter coasts. Where the coast is over 1 mile maybe.

I don't have a Scangauge. My car is OBD0.

I did achieve my goal of 40MPG this week. I took a slightly longer but not as hilly route to work.

If you don't have some sort of gauge that is calibrated, how do you come up with .1gph at idle?

I think that is closer to what you get with an original Insight.

My car is a 4cyl 6 speed that idles at 625 rpm and at idle burns .17 gph at 100F+ AIT.

[SentraSE-R]

EOC has a surprisingly large effect on mpgs when you're hypermiling. If you're averaging 60 mpg with EOC P&G, engine on 1/5 of the time, and averaging 30 mph, you're using .5 gal. on a one hour, 30 mile drive. If you NICE-on glide, your engine idles unnecessarily at at least .15 gph for 4/5 of that time. For a fuel-sipper like my Scion's 1NZ-FE engine, it drinks an additional .12 gal. in 48 minutes of idling time. My 60 mpg (30 miles/.5 gal) EOC P&G drops to 48.4 mpg (30 miles/.62 gal) NICE-on. That's a 20% penalty for engine-on coasting.

My SE-R idled at .22 gph. NICE-on P&G in my Nissan drops a 60 mpg EOC P&G from 60 mpg down to 44.4 mpg. The penalty for idle coasting is >25% with the Nissan, which has idle consumption similar to your truck.

That's why I can never top low 40 mpg in my wife's AT Hyundai Elantra. It has to have the engine running to lube the AT.

[endurance]

I really doubt the .1gph figure, too. I have a 2.0 liter Acura. When fully warmed up it uses .24-.27gph. However, when I first start it, it uses. .37-.41gph when the engine is in warm up mode. I'd suspect your little 1.8L engine is using .19-.23 warmed up.

Regardless, I'm seeing a solid 1.5-2mpg bump since I started EOC. Try it. If you don't notice a bump, don't bother. If you do, well, it's that much less money you're feeding into the machine.

[UFO]

Originally Posted by Weather Spotter

you can fix the SG, just put it into hybread mode, then it stays on.

That might work for a gasser, but diesel setting is required for mine to read correctly.