Crappy gas mileage...WTF?
01-03-2013, 05:43 PM
#1
Intermediate
Thread Starter
Crappy gas mileage...WTF?
I have a 07 tl type S i just bought for the first few weeks i was getting 18-21 mpg around town and were i live at the MPH is 35 in most areas,
however i recently started getting 14-16 MPG around town, i checked my air filter and its clean and fine, i havnt checked anything else out yet but any ideas as to what to look for and or why im getting such crappy gas mileage would be very helpful
i dont speed i keep my foot off the gas as much as possible i just cruise it with from time to time getting on it but rarely do i do that....
i fig i am going to check spark plugs, o-rings on the fuel injectors, my oil life says 50% but i doubt that would cause such a drop in MPG, and thats all that i can think of off the top of my head without having to dig deep and take alot of crap apart just to look at, like fuel filter....but any thing else i need to look at, and for...and yes my fuel cap is locked on tight....i was also thinking maybe the PCV valve could attribute to this???
however i recently started getting 14-16 MPG around town, i checked my air filter and its clean and fine, i havnt checked anything else out yet but any ideas as to what to look for and or why im getting such crappy gas mileage would be very helpful
i dont speed i keep my foot off the gas as much as possible i just cruise it with from time to time getting on it but rarely do i do that....
i fig i am going to check spark plugs, o-rings on the fuel injectors, my oil life says 50% but i doubt that would cause such a drop in MPG, and thats all that i can think of off the top of my head without having to dig deep and take alot of crap apart just to look at, like fuel filter....but any thing else i need to look at, and for...and yes my fuel cap is locked on tight....i was also thinking maybe the PCV valve could attribute to this???
01-03-2013, 07:47 PM
#3
I do a lot of city driving myself and I'm getting around 17 mpg as well, there's nothing wrong with your car. Lots of factors are involved with efficiency, tire pressure, acceleration (how much of a lead foot you are), whether or not you coast to stop lights, uphill/downhill driving, etc.
01-03-2013, 08:07 PM
#5
Instructor
What's your average MPH on the MID? With 35 mph speed limits in Fort Worth, it wasn't unusual for me to creep into 15/16 mpg territory driving pure city, with my mph at 17-18 IIRC.
Just asking avg MPH for the horde of people going to come in and ask you anyways, but you'll see that mpg will correlate with your mph.
Just asking avg MPH for the horde of people going to come in and ask you anyways, but you'll see that mpg will correlate with your mph.
01-03-2013, 08:14 PM
#6
KingKong_Dav
one thing you have to understand about the tls when you wot one time it uses a lot of gas and it quickly adjusts the mpg on your odometer. stay light on the pedal
01-03-2013, 08:18 PM
#7
-Brandon
The TL gets decent mileage considering its size, but I don't get crazy high numbers when I'm driving short distances around town with lights/construction/traffic. I usually average 17 or 18 with an occasional 19-20MPG when I'm light on the pedal keeping RPMs under 1700.
Two totally dumb but necessary questions: Are you running on Premium fuel & are your tires inflated properly?
Two totally dumb but necessary questions: Are you running on Premium fuel & are your tires inflated properly?
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01-03-2013, 08:18 PM
#8
i get very crappy miles than all of you guys.. 13mpg city. i get 28 highway though. and the mid keeps reminding me to "tighten fuel cap" does that have anything to do with the fuel mileage?
01-03-2013, 08:51 PM
#9
Safety Car
iTrader: (4)
Not sure if this info can be useful to you or not, but my 08 Type S 5at averages between 21-23mpg with 90% far suburban mileage. So its by no means hard core city stop and go, just far suburban and minimal highway.
I would say for city driving mid teens is probably common in most vehicles.
I would say for city driving mid teens is probably common in most vehicles.
01-03-2013, 09:13 PM
#10
Just going out and saying you are getting 20 MPG means absolutely nothing. If you live in a very cold climate, idle your car excessively to warm it up, go WOT into red lights all day, maintain very low or very high speeds, and constantly go on drives far too short for the engine to fully warm up, it's extremely possible to get 2-5 MPG. Idling the car and not moving results in 0 MPG, so if you did this the entire tank, you could technically get 0 MPG with absolutely nothing wrong with the car. On the other hand, if you live in an ideal climate, drive at a constant 40 MPH with a 6MT, practice ideal throttle application, and never stop, you can get easily 40-50 MPG over a tank.
Everything you do typically has SOME impact on fuel consumption. It just depends as to if its significant enough to matter or not. Cold weather will absolutely TRASH your fuel economy. Cold engines are not efficient at all. I typically see 5-10 MPG on short drives in very cold weather with absolutely no warmup time, and nearly ideal driving in minimal traffic at nearly ideal speeds. Typically this isn't that big of a deal over the course a tank, since short drives are short. However, if the bulk of your tank is made out of short drives with substantial enough time between for the engine to cool, you will get very poor fuel economy with a perfectly running car.
Just a few exceedingly important factors in fuel economy are ambient temp, driving style/vehicle use, average speed, frequency of stops, and rolling resistance. A part of the problem is that the TL is actually a comparatively fuel efficient vehicle. This almost always means the variances between users and conditions is going to be larger. WOT acceleration isn't all that big of a deal, but its going to trash your fuel economy if you ride your brakes, or go WOT only to slam on your brakes. Using fuel cut to your advantage can have a substantial impact if you stop from speeds above 45-50 frequently. But whats going to make the largest impact on your FE for a given commute is stopping less. Avoid full stops, avoid needing to use brakes. This means thinking, looking farther ahead, and predicting. Don't roll into a red light at 50 and jab the brakes. Let off the throttle early and under certain circumstances the injectors shut off, so the car is using no fuel as you roll to the light. Ideally, you would take longer to get to the light anyways, so when you get there the light changes and you are still rolling at 20-30 MPH. Driving like this can have a VERY substantial impact on your fuel economy, but its not always possible or practical depending on where you live and typical traffic.
Unless you are SURE nothing at all changed between the tanks, which is nearly impossible to do, I would avoid passing judgement unless it proves to be an obvious and serious problem.
Everything you do typically has SOME impact on fuel consumption. It just depends as to if its significant enough to matter or not. Cold weather will absolutely TRASH your fuel economy. Cold engines are not efficient at all. I typically see 5-10 MPG on short drives in very cold weather with absolutely no warmup time, and nearly ideal driving in minimal traffic at nearly ideal speeds. Typically this isn't that big of a deal over the course a tank, since short drives are short. However, if the bulk of your tank is made out of short drives with substantial enough time between for the engine to cool, you will get very poor fuel economy with a perfectly running car.
Just a few exceedingly important factors in fuel economy are ambient temp, driving style/vehicle use, average speed, frequency of stops, and rolling resistance. A part of the problem is that the TL is actually a comparatively fuel efficient vehicle. This almost always means the variances between users and conditions is going to be larger. WOT acceleration isn't all that big of a deal, but its going to trash your fuel economy if you ride your brakes, or go WOT only to slam on your brakes. Using fuel cut to your advantage can have a substantial impact if you stop from speeds above 45-50 frequently. But whats going to make the largest impact on your FE for a given commute is stopping less. Avoid full stops, avoid needing to use brakes. This means thinking, looking farther ahead, and predicting. Don't roll into a red light at 50 and jab the brakes. Let off the throttle early and under certain circumstances the injectors shut off, so the car is using no fuel as you roll to the light. Ideally, you would take longer to get to the light anyways, so when you get there the light changes and you are still rolling at 20-30 MPH. Driving like this can have a VERY substantial impact on your fuel economy, but its not always possible or practical depending on where you live and typical traffic.
Unless you are SURE nothing at all changed between the tanks, which is nearly impossible to do, I would avoid passing judgement unless it proves to be an obvious and serious problem.
01-03-2013, 09:30 PM
#11
Drifting
^as everyone has said and the many threads. Something changing in the commute driving pattern: job location, cold weather forcing idling/warmup, not filling up the tank consistently will be the main factor.
I promise you your problem is not injectors, or air filter. Check your tire pressure since cold temperatures reduce pressure- but even that is not going to cause a 15% drop.
Boss needs to give the average MPH that the MID shows in addition to MPG. I'll place a bet for <20 MPH as the likely culprit.
I promise you your problem is not injectors, or air filter. Check your tire pressure since cold temperatures reduce pressure- but even that is not going to cause a 15% drop.
Boss needs to give the average MPH that the MID shows in addition to MPG. I'll place a bet for <20 MPH as the likely culprit.
01-04-2013, 12:38 AM
#12
Team Owner
It blows my mind these threads still get posted and its worse when a slew of posters follow suit completely clueless. Nothing is wrong with your Tl. Post your average mph according to the mid and you will find that your mileage is the same as any other Tl with that average mph.
01-04-2013, 09:13 AM
#14
BANNED
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