Poor fuel economy from A4 w/ 2.0 TFSI engine
1st Gear
Joined: Jan 2011
Posts: 102
From: North Texas
bringamac92- That's awesome you got 36 mpg! The best I've ever got was about 27.5 on a flat and straight interstate going about 75-80 mph. I wish we could get 93 octane up here, but unfortunately the highest octane they sell is 91. I'm not for sure why they do that, I've heard some people say it has to do with the higher elevation, and I've heard other people say it's to try and reduce emissions, but I don't know if either one of those is correct.
shell is good quality fuel. see: www.toptiergas.com it's all i use.
you're right. i use 91 in my golf and i get better milage than if i use 87. at the end of the day it probably balances out-cost wise, but the 91 has more cleaning agents and is probably cleaner burning.
as for the fuel economy. i live in -40 winters and my milage is greatly affected with the cold weather. maybe it's because of the grease in the diff or in the wheels or something. or maybe it's because the engine is really cooled-especially with the intercooler, so you're getting much denser air-leading to more power and fuel consumption. even my golf gets worse milage in the winter. the tire walls also get stiffer, leading to more fuel consumption.
you're right. i use 91 in my golf and i get better milage than if i use 87. at the end of the day it probably balances out-cost wise, but the 91 has more cleaning agents and is probably cleaner burning.
as for the fuel economy. i live in -40 winters and my milage is greatly affected with the cold weather. maybe it's because of the grease in the diff or in the wheels or something. or maybe it's because the engine is really cooled-especially with the intercooler, so you're getting much denser air-leading to more power and fuel consumption. even my golf gets worse milage in the winter. the tire walls also get stiffer, leading to more fuel consumption.
to answer this and B7Night's note about winter related lower mpgs.... You're suffering from what we in the Midwest call "Winter Gas".
Cars using summer-blend gasoline spew fewer harmful emissions and get slightly better fuel economy than those using winter-blend gas during the summer months.
The difference between conventional summer- and winter-blend gasoline has to do with the Reid Vapor Pressure of the fuel. RVP relates to the volatility of a gasoline. The more volatile a gasoline, the more likely it will evaporate as the temperatures rises; evaporated gasoline contributes to unhealthy ozone and smog levels. Summer gasoline has a low RVP and is less likely to evaporate when compared to the high RVP winter grade. The Environmental Protection Agency says conventional summer-blend gasoline contains 1.7 percent more energy than winter-blend gas, which contributes to the summer blend’s slightly better gas mileage.
The Energy Information Administration says the switch between the two fuels happens twice a year, once in the fall (winter blend) and again in the spring (summer blend). Summer-blend gasoline is typically more expensive to produce than the winter blend, and it won’t affect vehicle performance or the durability of the engine and fuel system, according to the EPA.
In many large cities as well as California and New England, the EPA requires the use of reformulated summer- and winter-blend gasolines. These RFGs contain oxygenates that lower RVP and other toxic chemicals even further than conventional gasoline.
Or maybe it's because you let your vehicle warm up for an hour before you drive it in those cold months
......
1st Gear
Joined: Jan 2011
Posts: 102
From: North Texas
here in texas we shut down towns and neighborhoods for 2 inches of snow and 20 degree weather lol
2nd Gear
Joined: May 2010
Posts: 685
Nah, I get about 20 or a little over with my 99% city driving. The beauty of a 4-cyl. It somewhat makes up for the about 14mpg my wife's Jeep gets.
1st Gear
Joined: Dec 2009
Posts: 83
From: Chicago, IL
I get around 17-19 city on my 7 mile (one way) commute to work here in Chicago. One street, straight road, completely flat, but with 10-15 traffic lights. (in fact I don't think there is even a single hill anywhere in Illinois). I've gotten it up to 21-22 with veeeery slow pulling off at the light. I've gotten 27-28 highway with 1hr cautious driving, but as soon as I went through a toll gate, it went down to 25-26. Only good thing is we have 93 up here. It makes up for the highest gas prices in the states (I think). I've never even seen 91.
If you have an auto it helps if you shirt gears yourself at low rpm, but that's boring... I say - Pedal to the metal, and live with low teens-mpg!!!
If you have an auto it helps if you shirt gears yourself at low rpm, but that's boring... I say - Pedal to the metal, and live with low teens-mpg!!!
Thread
Thread Starter
Forum
Replies
Last Post
shutty
Computer & Fuel Systems
2
Apr 16, 2012 01:59 AM
