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Old 09-09-2008, 08:27 AM   #1
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Civic VX -post your MPG

...along with vehicle mods, type of driving & comments. My hope is that this will give other VX owners a feel for how their FE stacks-up with others. Here's mine:

vehicle: 92 Civic VX (stock)
odo: 135k
MPG mods: none
last tank MPG: 44
hwy/city: 70/30%
comments: Last tank was used entirely for my a daily 80-mile round-trip commute between Annapolis, MD and Arlington, VA. It's primarily highway, where I try to keep it <70MPH, but also has some city driving, traffic lights and stop-n-go traffic. I do attempt to conserve fuel in my driving techniques, but I am not a hypermiler. No drafting EOC, etc.
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Old 09-09-2008, 08:36 AM   #2
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94 VX, 184k miles
Bone stock, 0w30 synthetic
Mild hypermiling (more like just driving like a sane person, occasional EOC)

Last tank was 49.3
average over about 12 tanks is 44

I have an MPGuino almost completed (basically a Scangauge for pre-OBDII cars) and a grill block almost ready to pop in. So 2 "almost" mods. I'm sure the power of positive thinking is getting me an extra 2.371%

My gas log has a big dip in it... i think most of that can be attributed to a slow air leak in one tire that went unnoticed for quite some time. Yeah I know, I should be checking my tires hourly.
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Old 09-09-2008, 08:43 AM   #3
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1994 cx with a vx swap. mods are vx wheels with 50 psi in the tires, intake tured to face the radiator. and i just swaped it last week with the first re fill i got 44 mpg with all atlanta city driving! i have some hwy miles on this tank so i cant wait to see the result!
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Old 09-09-2008, 09:12 AM   #4
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1994 Civic Del Sol with D15z1 Swap, HX wheels and Grill Block, 38mpg on my last tank which was probably 10% Hwy and 90% City, I was able to get 50mpg with a 100% Hwy before the HX wheels and grill block, have a bunch of aero mods planned to just need to find some time to install them...

I was thinking of starting a thread for VX driving hypermiling to see what people were doing that work specifically for the VX...
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Old 09-09-2008, 01:10 PM   #5
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I have 2 VXes - 92' Canadian model with 140K and 94' US with 260K. Both get around 44 MPG 50% city/highway. Highway driving is 62 in 55mph and 72 in 65mph.

No mods and none planned, no hypermiling - just driving gently to minimize the cost of fuel and maintenance. All in all they get around 50MPG highway and 40 city - just like EPA said.

Ross
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Old 09-09-2008, 04:13 PM   #6
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I have a 1990 hatch with a VX engine (JDM D15B) and HF transmission transplanted into it. I drive about 25% hwy and 75% city and average about 47mpg. I drive relatively gently, no specific hypermiling techniques and usually 5-10 mph over the limit. My tires are at 42psi, I have a WAI, a trip computer from an 88 Acura, and an led that lets me know when I'm in lean burn mode. That last has probably helped modify my driving more than anything else. I'm still trying to break 50mpg before winter, but I don't think I'm going to make it. Maybe next summer.
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Old 09-10-2008, 09:22 AM   #7
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49 MPG

70/30 Highway/City

Driving the speed limit


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Old 09-10-2008, 12:04 PM   #8
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about that Lean Burn LED...

Quote:
Originally Posted by nowhhs View Post
and an led that lets me know when I'm in lean burn mode. That last has probably helped modify my driving more than anything else.
I'm interested in this and some time ago ordered some parts to buld a comparator-based circuit to control a lean-burn LED indicator. Are you willing to post details of how you built/implemented your Lean Burn indicator?

PS: Thanks to all who have posted on this thread. I'm amazed at the variance and would love to get the 50+ highway MPG that some of you are achieving!
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Old 09-10-2008, 03:05 PM   #9
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Lean Burn LED

No problem. I started with the information here: (Thanks TomO)
http://www.gassavers.org/showthread.php?t=2427. I monitored the actual voltages for a while (a couple of weeks), and in my case, when the voltage exceeded about 3 volts (see post #20 for where I got that), I could tell I was in lean burn. You can feel it going into and coming out of it if you pay close attention. Then I took the information from here:
http://www.autospeed.com/cms/A_1716/...popularArticle and made up a circuit similar to that one. The differences are: 1) I added a 7809 voltage regulator to the supply voltage so that voltage fluctuations in the 12volts don't effect the set point (the author of that article addresses that issue at the very end - but I disagree with him, fluctuating supply voltage made a pretty big difference in the reference voltage) 2) I reversed the O2 signal and the reference voltage (pins 2 and 3) so that the led turns on as the voltage increases past the setpoint. The circuit autospeed has is designed so that the led lights when the voltage falls. I also chose a 330 ohm resistor rather than a 470 because I wanted the led brighter, but that probably doesn't matter much.

I've learned some interesting things from that light, for example I get better fuel economy in 4th gear if I can keep it in lean burn than in 5th without it. Significantly better in fact. The tendency is to get into 5th as fast as possible, but sometimes being in that tall a gear requires throttle positions that take you out of lean burn mode. And of course every situation is different. YMMV


BTW according to the gassavers garage, we have a lot more than just 5 or 6 VXs here. Come on people, post.
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Old 09-10-2008, 04:46 PM   #10
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I drive 90% city any usually end up around 43mpg.
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