civic question - Fuelly Forums
Go Back   Fuelly Forums > Fuel Talk > General Fuel Topics
Search Today's Posts Mark Forums Read
Thread Tools Display Modes
Old 06-25-2009, 08:45 PM   #1
Registered Member
Join Date: Apr 2009
Posts: 52
Country: United States
civic question

i have a 2000 civic lx auto 4 door that i drive about 400+ miles a week (work 4 10s a week and commute 100mi a day round trip) and have noticed that the top half of the tank averages about 220-240 miles and the last half gets about 180-190 miles. has anyone had their tank out? does it taper down from top to bottom? i have been averaging between 35-40mpg driving 1mph below all posted speed limits with a/c on on the return trip in the afternoon. im also unfortunately driving on siped snow tires that are hella grippy, so i know im losing a ton of energy through tire resistance. im gonna start doing some aero mods pretty soon, need to find out an attractive looking way to fill in the fog light recesses in the front bumper and also try covering the outer lower grill opening(in bumper cover). i have access to some pretty nice sheet metal tools at work, and can get a pretty groovy discount on sheet metal so i will be covering the underside in aluminum in time as well. has anyone tried diffusers/flares in front of the wheel openings to divert air around the tires? i have been thinking about trying this out as well.. i have been thinking about ways to legally remove both side view mirrors, possibly using small 2.4ghz cameras on the outside, and 3"-4" color lcd screens inside the car. thoughts advice or opinions?

nate sanders

the less throttle you give, the more mileage you get!
hi tech hillbilly is offline   Reply With Quote
Old 06-26-2009, 03:30 AM   #2
Site Team / Moderator
Jay2TheRescue's Avatar
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,602
Country: United States
Location: Northern Virginia
This is true of almost all vehicles. The problem isn't the tank. As a matter of fact, for the gauge to read more accurately, the tank would need to widen towards the bottom. This is due to the simple fact that your fuel tank sensor is nothing but a variable resistor. As a general rule, when a resistor is halfway, you don't get exactly 1/2 the current. Variable resistors have a "curve" that they operate on. To get one that reads exactly you would need a linear variable resistor, which is very expensive. The automakers usually favor something that averages out. You could put the slow end either at the top, or the bottom of the tank. My guess the automakers put it at the top of the tank because of perceptions that the vehicle maybe doesn't get good mileage Just because the gauge pulls off of Full within 20 miles. I often hear people brag that they can drive 100 miles before the needle dips below Full. They say nothing about the vehicle only going 100 miles between 1/4 tank and Empty.



Jay2TheRescue is offline   Reply With Quote
Old 06-26-2009, 04:33 AM   #3
Registered Member
Join Date: Apr 2008
Posts: 1,090
Country: United States
Location: wiliamsburg virigina
Refill the tank at 3/4, 1/2 and 1/4 to see what actually is the true reading.

My Echo took 6.067 gallons at 1/2 tank. The tank is supposed to hold 11.9 gallons. I was at 311 miles, 51.26 MPG.

Most of the guages I have seen are fairly accurate at 1/2, then drop quickly to 1/4 then if you run it dry it will definitely take longer than from 1/2 to 1/4.

I believe this is because they do not want you to fun it dry, bad for in tank electric fuel pumps.

R.I.D.E. is offline   Reply With Quote
Old 06-26-2009, 05:12 AM   #4
Registered Member
palemelanesian's Avatar
Join Date: Apr 2013
Posts: 364
Country: United States
I keep records of gallons (calculated from miles and scangauge mpg) at the marks on the gauge. My experience matches yours.

F - 1/2 = 4.9 gal
1/2 - E = 3.9 gal

(you can fit 3+ gallons above F if you are patient at the pump)
palemelanesian is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Ohio in da house MiddleMike Introduce Yourself - New member Welcome 0 05-29-2008 06:47 AM
Amazing how much speed really affects gas mileage!! smccall General Fuel Topics 6 05-21-2008 01:35 PM
Gas to Diesel Engine Swap Davo53209 Diesels 0 04-20-2008 07:53 PM
? for dmm user's, monitoring lean burn rlprlp1 General Maintenance and Repair 4 12-17-2007 10:16 AM
GM: Petrol is Dead Silveredwings Automotive News, Articles and Products 6 06-12-2007 11:06 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 11:29 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.