08-10-2008, 12:37 PM
This is to Larry and Shawn.
View Full Version : Fit FE best practices.
08-10-2008, 12:37 PM
This is to Larry and Shawn.
08-11-2008, 12:29 PM
Well, I am no Fit man, but I think your biggest obstacle is speed, because you seem to be doing everything else right. Larry "tries not to" go over 50. This is particularly important because the the unfavorable gear ratio.
08-11-2008, 08:04 PM
I should be into a 60+ mpg on this tank. For me it was just a matter of finding the sweet spot for P&G. With ice-on P&G I got 45 mpg, FAS and P&G I got 54.5 and 57.6 mpg doing a 60-50 mph cycle. I don't have a SGII, so it comes down to my tank average as my learning tool.
Now I am doing a 60-45 mph and when traffic permits a 60-40 mph cycle with about 70% throttle. I am at 550 miles on the tank without a gas light turning on, and I think it will be close to 600 before it comes on.
Dropping my low target speed by 5-10 mph has helped a lot.
08-11-2008, 09:31 PM
Paul, it seems I am pretty much in line with your numbers now. Dropping speed definitely helps though, but things are nasty enough when I am going 50 in a 65 at the bottom of my 50-60 P&G routine as it is.
08-12-2008, 02:52 AM
How did you measure 70% throttle or is that just a swag? Sounds way more agressive than the recomend 80% LOD I used.
On you 40 to 60 pulse. Is that 5th gear in MT?
Can you stop watch one cycle next time for me? Pulse and glide
Do you happen to record the miles till the F mark after a fill up.? I just figured out my fill is all over the place.
Sorry to see the other two aces did not respond to my call for help.:rolleyes:
The P&G is on a 08 Fit 5 speed, bone stock with 3200 miles.
The throttle % is an estimate, though I am sure it is pretty close due to all my tuning runs in my old 300 whp turbo single cam civic. I have gotten pretty good at throttle % estimates due to that.
70% is actually right in the parameters of how hard you want to accelerate with the Fit in a P&G cycle. Maximize the coasting time and cut down on the pulse time.
I am not sure if I can get a stop watch on it for you, since it is hard to juggle all of this as it is on a SoCal freeway. I have used the CD player timer to track coast time, and my average coast is between 18 and 22 seconds, and the pulse time is usually less than 10. My max coast on my trip is 2.2 miles flat ground, max speed of 55 mph and a low of about 20 mph (side street leading to my house).
Other than that, I cannot claim to be any expert. This is only my 4th tank of hypermiling. I have gone from 32 mpg, to 57 mpg in 3 tanks. This 4th tank I am hoping to be well into the 60 mpg range.
08-12-2008, 01:57 PM
2008 Fit Sport w/ Automatic, just had our best tank to date at 42 mpg over 403 miles.
This was mostly interstate 70 PSL driving in the rain with significant periods of moderate traffic.
Fit has 7500 miles on it at 5 months of age.
Running sidewall max of 51 psi on the stock tires.
I feel limited with the auto tranny to only fas when I get good long downhill. Try to start at 70, glide down as traffic permits as low as 50. Seemed to take two climbs and a downhill between them to regain speed and set up for the next fas. In other words, after FAS, I climb next grade near low end of FAS speed, regain speed on the next down, hold that speed on next climb trying to coax a lean burn. She's too light to really roll as long as I'd like; sort of surprised at 51 psi not to keep speed longer. Highway wind resistance just stinks.
Also, with the rain and the Fit's tiny battery, I was very limited in FAS time by voltage (headlights). In the rain, best approach was to get 2 seconds back of a pickup/RV and hold pretty steady in low 60s mph.
Did some Nice-on on shorter opportunities to P&G in a narrower band. I can see how the MT would crush me with bump starting in HS P&G and greater regularity of fas. Re-engaging the AT at speed still makes me uneasy, so again, I look for a few long FAS's.
My speed averaged probably 60 mph. I think with dry conditions and lighter traffic I might coax 50 mpg from her. Total commitment to FAS would be needed. Steady state max on the freeway for me is low 40s mpg.
Very impressed with you folks doing 50 and 60 mpg. Any of those AT's? What suggestions would you give me?
08-12-2008, 11:03 PM
When I was P&Ging at 60-45 I was getting between 55 and 57. Perfecting the 50-40 got me up to 65. My other strong suit is keeping my high mpg when I get into stop and go traffic. I can P&G in 3rd gear at 12-18 mph and still maintiain my 60+. I think learing to use FAS P&G at these speeds is critical (if you drive Bay area clogways) The next thing is the grill block. Without it warm up gas usage eats my lunch on the short (23 mi) commute. Finally is months of practice. Perfect it on the highway then duplicate it on city streets. I can duplicate my highway mpgs on city streets when it is not heavy traffic. Based on Andrews comments, I have just lately started paying attention to LOD. I had gotten a 60 mpg tank already, but I think keeping LOD below 90 (I was previously running between 95 and 98) netted me another 1.5 - 2 %. Any time you come up to Norcal let me know and I will show you real time.
Ksstathead: Having the auto is an automatic liability. Tell you what, Take a steady state reading driving 1950 RPM in top gear. Tell me your speed. LOD value and "instantaneous" mpg (it should be constant).
08-13-2008, 08:28 AM
I just saw this thread(wasn't ignoring you.
I am with Larry on this. Decrease Speed and P&G FTW!
I P&G every chance I get. What I typically do is FAS once I reach the top speed no matter where I am, therefore not staying in my top speed for any lenght of time.
08-13-2008, 09:05 PM
What the heck am I missing on this???Just wanted to save that lttile bit.
Well I guess that leaves the extra heat from the grill blocks? Did you block the upper two or Lower 2 or both?Also quoted for posterity. Since there' no popcorn... :Banane38:
vBulletin® v3.6.7, Copyright ©2000-2013, Jelsoft Enterprises Ltd.