Quote:
Originally Posted by d0sitmatr
I did this behind a fairly large truck that was running 5 under, and I think I averaged close to 50% increase, but I did it only because I was in a bad spot when my fuel light came on with no recourse but PnG or run out of fuel  |
Impress your friends and family by saving them from standing on the shoulder! Thanks for all the responses and questions guys. I went through and tried to respond to each below:
“Is the whole course uphill?”
No. It is mostly uphill. Possibly 1.5 of the 5.7 miles are flat with a slightly descending grade. Two are flat/mild and one is a pretty good but short favorable hill. There are three sections of steep hills. In general I am climbing from near sea level to several hundred feet during this 5.7 mile run.
“What is a typical glide time between pulses?”
Sorry, but I have never tried to track that. But it is definitely shorter running uphill than down.
“Just to clarify, engine is on the whole time, right? Also how did you measure engine load, is it a scangauge function?”
The engine is on the whole time because that is safer for me, the car, and everyone at highway speeds. I use an Ultra Gauge, which offers a load reading, but I hear Scangauge does too.
“Ahh: Found this: Introducing "LOG"”
“Still, how does that work on hills exactly?”
I will accelerate uphill and see 25mpg numbers on the Instant MPG readout but even gliding uphill with the engine on in neutral the instant MPG reading shows numbers like 234mpg at 65mph. So, gliding uphill my average trip FE starts to climb again. But don't be fooled. My average between accelerating uphill and gliding uphill goes down still, just not as fast or as far. The gains on the shorter flat and slightly descending sections are high enough to fully compensate--even though the flat sections are shorter than the uphills.
“P&G is currently defined as accelerating at higher engine loads, followed by coasting with the engine turned off. Restart and repeat.”
I did not know only engine off was considered P&G here. Thanks.
“The only difference is he is leaving the engine running instead of shutting it off during the glide.”
Yup.
“You could use PNG-on and PNG-off to differentiate.”
Sounds good to me. GLEN was just my mnemonic device, and it carries one piece of info P&G lacks. I wanted a name that carried a reference to DWL in it. Doing a P&G, as you know, without high load, will not accomplish much other than wear-out your foot.