Miles to TANK, S4 ONLY
01-15-12, 12:58 AM
#1
The Blue Blur
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Miles to TANK, S4 ONLY
N/A to be more specific.
So I have recently done a few things that have helped my car run a little smoother and was astonished by how many more miles to the tank I am now getting. I'm curious as to what's the normal average. I was getting about 198-200 miles a tank.
I cleaned some plugs to the harness for the coils and CAS, tweaked my TPS and lowered my idle. I just hit 248 miles to a tank tonight. I'm measuring this as a full fill up then running till the needle hits the black between the two fat orange lines above e, so I'm making my measurements using the same amount of fuel each time.
I realize that there is still a gallon or two left but to go from roughly 200 to 248 without changing my driving style seems pretty incredible for a few minor tweaks. The car seems to idle a bit smoother but not enough to explain this. Might be worthwhile for everyone to do a little contact cleaning and tune up. Get you a few miles extra between fill ups.
So I have recently done a few things that have helped my car run a little smoother and was astonished by how many more miles to the tank I am now getting. I'm curious as to what's the normal average. I was getting about 198-200 miles a tank.
I cleaned some plugs to the harness for the coils and CAS, tweaked my TPS and lowered my idle. I just hit 248 miles to a tank tonight. I'm measuring this as a full fill up then running till the needle hits the black between the two fat orange lines above e, so I'm making my measurements using the same amount of fuel each time.
I realize that there is still a gallon or two left but to go from roughly 200 to 248 without changing my driving style seems pretty incredible for a few minor tweaks. The car seems to idle a bit smoother but not enough to explain this. Might be worthwhile for everyone to do a little contact cleaning and tune up. Get you a few miles extra between fill ups.
01-15-12, 01:28 AM
#2
Nice numbers, my car has 119xxx miles, and it must have been taken good care off cause my low mile tanks are 215-220 miles and my high end is 270-300 miles per tanks. But normally i average 18-19 mpg. Car is s4 na, only 'mod' engine wise is a test pipe instead of the stock cat.
Edit: Forgot to say i fill up when my needle is below the double orange lines, so about 14-15 gallons a fill up.
Edit: Forgot to say i fill up when my needle is below the double orange lines, so about 14-15 gallons a fill up.
Last edited by MrGoodnight; 01-15-12 at 01:31 AM. Reason: Add info.
01-15-12, 03:53 AM
#3
I used to go 320 miles before my fuel light would ding on, then i could go another 30 before id really worry for fuel.
Car was a 88 SE base that i had swapped the hubs and brakes out to GXL/Vert/Turbo equipment, usually ran 205/55 R15's @30psi.
No PS, AC, manual crank windows, no sunroof, no rear wiper, no emissions. Exhaust was completely chucked in favor of a Racing Beat Header/Presilencer and then ran 2.5" piping to a single exit magnaflow muffler. I also had a ford taurus Efan and an exposed cone filter sucking in hot engine bay air, as well as no factory undertray.
Also had an Apex'i SAFC II that I used to tune out (be feel as I didnt have an AF gauge setup) fuel all across the RPM range (though mostly around idle and lower RPM's). Also had a fairly lead foot, and even got the same MPG's running hard on the dragon (us129) leaving it 2nd gear for the 11mile stretch of curves.
Edit: I also changed both my plugs and O2 sensor every year, never once replaced the plug wires, though I did keep the engine bay pretty clean with multiple power washing sessions over the summer and at least once during the winter when it was daily'd
Car was a 88 SE base that i had swapped the hubs and brakes out to GXL/Vert/Turbo equipment, usually ran 205/55 R15's @30psi.
No PS, AC, manual crank windows, no sunroof, no rear wiper, no emissions. Exhaust was completely chucked in favor of a Racing Beat Header/Presilencer and then ran 2.5" piping to a single exit magnaflow muffler. I also had a ford taurus Efan and an exposed cone filter sucking in hot engine bay air, as well as no factory undertray.
Also had an Apex'i SAFC II that I used to tune out (be feel as I didnt have an AF gauge setup) fuel all across the RPM range (though mostly around idle and lower RPM's). Also had a fairly lead foot, and even got the same MPG's running hard on the dragon (us129) leaving it 2nd gear for the 11mile stretch of curves.
Edit: I also changed both my plugs and O2 sensor every year, never once replaced the plug wires, though I did keep the engine bay pretty clean with multiple power washing sessions over the summer and at least once during the winter when it was daily'd
01-15-12, 03:53 AM
#4
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The gauge is not accurate. Use this method instead:
1) Fill up the tank all the way.
2) Record the odometer reading or zero-out the trip meter.
3) The next time you fill the tank, record the number of miles driven and the amount of fuel needed to fill the tank all the way again.
4) Divide the number of miles by the number of gallons to determine the miles per gallon.
5) Search for one of the hundreds of gas mileage threads already on this forum.
1) Fill up the tank all the way.
2) Record the odometer reading or zero-out the trip meter.
3) The next time you fill the tank, record the number of miles driven and the amount of fuel needed to fill the tank all the way again.
4) Divide the number of miles by the number of gallons to determine the miles per gallon.
5) Search for one of the hundreds of gas mileage threads already on this forum.
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01-15-12, 01:18 PM
#11
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my last S4 would regularly do 280 miles before the light would come on, the most i was able to get was about 300.
actually to go the other way, 280 miles using 14.5 gallons of gas is 19.3 miles per gallon
actually to go the other way, 280 miles using 14.5 gallons of gas is 19.3 miles per gallon
01-15-12, 05:13 PM
#12
Wow, there is some awful mileage in here. Tune ups all around ASAP!
In my 87 TII (120k at the time) got 355 miles to the tank on 1-10 heading from Tallahassee to Batton Rouge). Mods at the time were cone filter and RB catback. In town I got 17mpg consistently under normal driving conditions.
Since then I've added an Rtek 2.1 downpipe and 720 secondaries. I now get roughly 230-260 miles to the tank with all city driving . Unfortunately I only get about 270-280 miles to the tank on the highway. (pretty sure the lower secondary staging point is to blame).
So if you're puttering around in an n/a getting less than 16/22 city/hwy you should be ashamed.
In my 87 TII (120k at the time) got 355 miles to the tank on 1-10 heading from Tallahassee to Batton Rouge). Mods at the time were cone filter and RB catback. In town I got 17mpg consistently under normal driving conditions.
Since then I've added an Rtek 2.1 downpipe and 720 secondaries. I now get roughly 230-260 miles to the tank with all city driving . Unfortunately I only get about 270-280 miles to the tank on the highway. (pretty sure the lower secondary staging point is to blame).
So if you're puttering around in an n/a getting less than 16/22 city/hwy you should be ashamed.
01-16-12, 05:08 PM
#14
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when i first got my s4 in 2004 i got 170 miles to a tank. just horrable. after gutting cat new exhaust plugs fuel injectors and doing a auto to manual swap i see around 240 now.. Not that great.
01-09-13, 11:24 PM
#15
Dam... I searched for "winter mpg" because I was worried about pulling 19's instead of 21's this winter.
I can do 25-27 on freeway trips, and my average is about 22. Most of my driving is highway though.
This might hurt:
https://dl.dropbox.com/u/5310442/198...%20mileage.xls
Street ported, atkins 6 port sleeves, RB header + presilencer
Also... everyone should pay attention to Evil Aviator's post about how to calculate your mpg. Per tank is so varied and it's practically a pointless measurement. The gauge is below the double lines when it still has almost 4 gallons (1/4 tank) most of the time for me.
I can do 25-27 on freeway trips, and my average is about 22. Most of my driving is highway though.
This might hurt:
https://dl.dropbox.com/u/5310442/198...%20mileage.xls
Street ported, atkins 6 port sleeves, RB header + presilencer
Also... everyone should pay attention to Evil Aviator's post about how to calculate your mpg. Per tank is so varied and it's practically a pointless measurement. The gauge is below the double lines when it still has almost 4 gallons (1/4 tank) most of the time for me.
01-10-13, 05:23 PM
#21
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01-11-13, 01:03 AM
#23
It did 347.9 on 12.883 gallons of gas. That equates to 27 mpg. It's a 16.6 gallon fuel tank. 16.6 X 27 = 448 mi
Sure there is some margin of error, and I'm assuming that I'd be using my last 3.8 gallons of fuel as efficiency as my first 12.8, but when you do the math, you don't have to believe in anything.
You probably would have done more than 390 unless you were almost out of fuel when you filled up.
On road trips I typically just fill up anytime I'm below half or quarter tank and it's convenient.
Sure there is some margin of error, and I'm assuming that I'd be using my last 3.8 gallons of fuel as efficiency as my first 12.8, but when you do the math, you don't have to believe in anything.
You probably would have done more than 390 unless you were almost out of fuel when you filled up.
On road trips I typically just fill up anytime I'm below half or quarter tank and it's convenient.
01-11-13, 01:08 AM
#24
347.9 mi / 12.883 gal = 27.0045796786463 mpg
27.0045796786463 mpg * 16.6 gal = 448.276 mi
It's 27 and I'm proud.
You are using my rounded number of 448 and so are getting 26.9879518... which you would have to round to 5 decimal places if you wanted to say it was under 27
sorry... I'm a math major
It's a 1988 vert
Last edited by livevil904; 01-11-13 at 01:16 AM.
01-11-13, 02:00 AM
#25
S5's have 18.5 gallon fuel tanks, aka 70 litres (I'm Canadian, eh)
I know this is about s4's but I find it odd that I achieved 31mpg on the highway once (300kms and filled up for 23 litres or 187.5 miles and filled up 6.1 gallons) and got 30mpg another trip, same highway but I could not for the life of me get more than 300-350kms (220 miles at best) before my fuel light is on and even then I still drive for a bit before filling up in the city with a bit of highway which equates to about 13 mpg which is I assuming I have 1.5 gallons left in the tank.
Even if I drive slow and barely rev past 3-3.5k I still achieve 12-14 mpg city/highway mix/ What could cause such terrible city mileage but great highway mileage. I've changed the plugs and the fuel filter already and it can't be the thermostat since I'm almost never driving fast enough in the city for it to be in closed loop. I'm never in 5th gear, sometimes if I'm lucky.
All this in my 1991 N/A with only 105,000kms
I know this is about s4's but I find it odd that I achieved 31mpg on the highway once (300kms and filled up for 23 litres or 187.5 miles and filled up 6.1 gallons) and got 30mpg another trip, same highway but I could not for the life of me get more than 300-350kms (220 miles at best) before my fuel light is on and even then I still drive for a bit before filling up in the city with a bit of highway which equates to about 13 mpg which is I assuming I have 1.5 gallons left in the tank.
Even if I drive slow and barely rev past 3-3.5k I still achieve 12-14 mpg city/highway mix/ What could cause such terrible city mileage but great highway mileage. I've changed the plugs and the fuel filter already and it can't be the thermostat since I'm almost never driving fast enough in the city for it to be in closed loop. I'm never in 5th gear, sometimes if I'm lucky.
All this in my 1991 N/A with only 105,000kms