Bad fuel mileage (B5 S4)

[morris400]

i wondering if anyone else has noticed a decrease in fuel mileage this winter. i normally get around 430-450 befor the fuel light comes on. now im getting around 350 ish some times even lower. i dont let my car sit and warm up and i dont get in to boost cause weather and roads suck. i have also noticed the same in my 2007 jeep 3.7L. no heavy foot, just normal driving mix 50 50 hwy city.

[BaggedGLI]

Re: Bad fuel mileage (B5 S4)

Yup, went from about 550km's a tank to 350-400km's same driving.

[BolideVW]

Re: Bad fuel mileage (B5 S4)

Yep, I went down on mileage too (about 350 for a tank)

[stef2.7t]

Re: Bad fuel mileage (B5 S4)

Same here...but maybe because with this ice and snow on the ground I love pulling away from lights like a bat outta hell. Although I went from 550 a tank to just shy of 500.

[morris400]

Re: Bad fuel mileage (B5 S4)

since im not the only one im guessing that winter gas is to be at fault then here? also is ther any way to get better mileage in winter?

[sabbySC]

Re: Bad fuel mileage (B5 S4)

Run lower octane, at least than you can offset the loss in mileage with the price. If you aren't in boost, and the ambient temp is way lower you won't need the added octane that would normally be required.

[martin13]

Re: Bad fuel mileage (B5 S4)

Yep, I can get about 550 km if I go easy on my car in the summer. Only about 400 in the winter.

[Ur0Drivr]

Re: Bad fuel mileage (B5 S4)

I, personally, haven't seen any discernible change. Out of my last 5 fill-ups, only one was above my 12.31 Average. Although I granny her most of the time.

[R-Audi]

Re: Bad fuel mileage (B5 S4)

Ive noticed a big change with my car.. Almost the exact same numbers you are getting. Ive treid switching between Husky 94 and Shell 91 and get similar results.

[CGY_GTI]

Re: Bad fuel mileage (B5 S4)

My mileage is always worse in the winter. Right now I'm averaging anywhere from 9-10L/100km. There haven't been any really warm days since we did my tune, but if it's closer to 0, then I get about 8.5L/100km

[Parts Erik]

Re: Bad fuel mileage (B5 S4)

The fuel milage sucks because of the increased time the vehicle takes to warm the engine up from -10 and colder to operating temperature as opposed to the engine being 30+ degrees hotter in the summer. Time how long your vehicle sits at high idle in the winter upon first startup, it's about 10-15 seconds in summer unless it has sat. It can sit at high idle for 45-1 min or more if it is -10 or colder and it is parked outside. Once it drops to low idle there is still lots of fuel enrichment trying to get the engine up to operating temperature. Never mind how cold that air is hitting the rad when you are driving in -10, the car is always trying to get to its optimum operating temperature at the expense of fuel economy. This is typical with every modern vehicle, my S4's economy gets flushed down the toilet in the winter and my truck hits single digit MPG's. It sucks but it is what it is. The other thing too is some gas stations will bump up the ethanol content in thier 'winter' gas and vehicles '01 and older just don't like the taste of it which also hurts the fuel consumption during winter months.


Erik

[R_Ethug]

Re: Bad fuel mileage (B5 S4)

i've gone down a bit.. probably because a richer startup in the cold.. but i still get about 450-500/tank

[Parts Erik]

Re: Bad fuel mileage (B5 S4)

i've gone down a bit.. probably because a richer startup in the cold.. but i still get about 450-500/tank

Ya but I have grandparents who push thier buicks harder than you drive that thing.


Erik

[danosaur]

Re: Bad fuel mileage (B5 S4)

Thats terrible mileage! You better give the s4 to me. :P

[mk4jetta]

Re: Bad fuel mileage (B5 S4)

Meh my tdi still got 888 last tank