Pre-seafoam fuel economy was 17.8 mpg
10-23-2007, 09:06 AM
#21
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Damn. With 100% city driving, and LOTS of WOT pulls, general hard driving, and plenty of idle time I can still get 16-17mpg out of my '98 A4 w/2.73s car.
I would expect to see 25+ with pure highway driving.
I would expect to see 25+ with pure highway driving.
10-23-2007, 09:28 AM
#23
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I have the same car. I haven't calculated it ut that sounds about where my gas mileage is. I get 24 on the highway, but then again i cruise at 75-80 so that affects it some. I don't know about the city but its not good.
10-23-2007, 12:30 PM
#24
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BTW, my A4 has 3.23 rear (optional performance rear gear), which contributes to why my MPG is lower than other A4.
Lately I've been getting 12.5-14.5mpg 90% city.
Lately I've been getting 12.5-14.5mpg 90% city.
10-23-2007, 06:17 PM
#26
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The best you'll ever get with the A4 (and 2.73 gears) will be mid to high 20s on the highway, with easy driving.
10-23-2007, 06:31 PM
#27
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For the people on here who are getting below 20 mpg with stock internals - seafoam your car, change your sparkplugs and wires, change your fuel filter, air filter, switch to synthetic oil, flush your coolant and change your trans fluid (if you have an automatic) and switch your differential fluid to synthetic - I GUARANTEE you'll see a huge boost in mpg. If you still don't, your O2 sensors or coil packs may be deteriorating.
I highlighted fuel filter because a lot of people never change their fuel filter, ever. If you guys have 80,000+ miles...don't be surprised if you're on the STOCK AC Delco fuel filter. Fuel filters should be changed every 20,000 miles or less.
10-23-2007, 06:57 PM
#29
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The only reason is that some people don't maintain their car. I KNOW you maintain your car meticulously. So do I. New fuel filter, I keep up on all fluid and filter changes, new spark plugs and wires...I constantly replace parts, and I get 22 mpg with mixed highway and city driving, and that's with headers and 3.42's. Headers and 3.42's, untuned aside from the speedo, HELPED me. I got 19 mpg the first tank because the car was running a little rough immediately after the headers, but once it smoothed out, all my mods have helped my fuel economy.
For the people on here who are getting below 20 mpg with stock internals - seafoam your car, change your sparkplugs and wires, change your fuel filter, air filter, switch to synthetic oil, flush your coolant and change your trans fluid (if you have an automatic) and switch your differential fluid to synthetic - I GUARANTEE you'll see a huge boost in mpg. If you still don't, your O2 sensors or coil packs may be deteriorating.
I highlighted fuel filter because a lot of people never change their fuel filter, ever. If you guys have 80,000+ miles...don't be surprised if you're on the STOCK AC Delco fuel filter. Fuel filters should be changed every 20,000 miles or less.
For the people on here who are getting below 20 mpg with stock internals - seafoam your car, change your sparkplugs and wires, change your fuel filter, air filter, switch to synthetic oil, flush your coolant and change your trans fluid (if you have an automatic) and switch your differential fluid to synthetic - I GUARANTEE you'll see a huge boost in mpg. If you still don't, your O2 sensors or coil packs may be deteriorating.
I highlighted fuel filter because a lot of people never change their fuel filter, ever. If you guys have 80,000+ miles...don't be surprised if you're on the STOCK AC Delco fuel filter. Fuel filters should be changed every 20,000 miles or less.
When I'm easy on the car (limited WOT, mixed city & highway driving), I've seen 21-23mpg with the 2.73s. I've never done 100% highway between fillups, but I'm certain I could get 25+ if I did. Actually I wouldn't be surprised to see something like 27-28 if I did 100% highway, no WOT action, and limited my speed to about 65mph.
10-23-2007, 07:03 PM
#30
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Originally Posted by ChocoTaco369
For the people on here who are getting below 20 mpg with stock internals - seafoam your car
Originally Posted by ChocoTaco369
change your sparkplugs and wires
Originally Posted by ChocoTaco369
change your fuel filter, air filter, switch to synthetic oil, flush your coolant and change your trans fluid (if you have an automatic) and switch your differential fluid to synthetic
Originally Posted by ChocoTaco369
If you still don't, your O2 sensors or coil packs may be deteriorating.
Last edited by VIP1; 10-23-2007 at 07:08 PM.
10-23-2007, 07:21 PM
#32
Between my place and my parents house is 15 miles, I drove there and back for 30 miles total and I filled it up again with 1.01 gallons. Thats 30 MPG, why is it so high? lol
10-23-2007, 07:34 PM
#33
every fill-up doesnt go to the exact same spot. you might have put in .2 gallons more last time. bringing your MPG down to 25 with just that little 1/5th of a gallon difference. you have to go distances to find out the mpg
10-24-2007, 09:55 PM
#40
Seafoam is a solvent that you suck into your engine, let it soak, and then drive it to clean out the dissolved sludge. You can also add it to your gas tank to clean the fuel system. My local NAPA sells it.
Many people swear by it, others note that there are other products that work more slowly but that might do a much better job of cleaning out your engine, like Auto-RX. That's what I have in my crankcase at the moment.
Many people swear by it, others note that there are other products that work more slowly but that might do a much better job of cleaning out your engine, like Auto-RX. That's what I have in my crankcase at the moment.
