What gas mileage u guys get on ur 55? I have an 03 55...i consume about 17mpg, thats city and hwy driving, i want to get more but HOW?

 

I was getting between 9 and 11 (mostly city stomping) before adding TB and headers. Then, I was getting closer to 11 - 13 until the tune was added at which point I dropped to a solid 9. I'm not sure if that is because the car was heavily tuned or because I could rarely resist PUNCHING it.

 

I'm getting around 15mpg in city driving to and from work. On the way back from Miami when I bought the car a month ago, I got just over 19mpg.

 

MPG MPG & AMG do not belong in the same sentence

 

I get around 14 with conservative driving in town, but around 8-10 when hitting it hard. It truly is a gas guzzler. On the highway while cruising I get between 20-21.

 

Im starting to figure that out..

 

acetone.
I have been using it for years now, and it makes a difference in both MPG and responsiveness. The amount will however vary with every car. Usually, 2-3 oz per 10 gallons of fuel is what most websites recommend, but for me, that actually decreased MPG a bit. For my '02 S500, 1 oz/10 gallons seems to be the sweet spot. without the acetone, I get about 400 miles on a tank, with acetone, I can stretch it to 430-440 miles on a tank of gas. Maybe a slightly more acetone might yield me even a bit more MPG, but Im satisfied with the current dosage and benefits. Another major benefit of acetone in gasoline is much lower emissions, which is especially imprortant for all of you that live in states/countries where smog tests are mandatory.
But here is the trick on how to get it to work. You need to reset the ECU mixture adaptation. you can achieve this in two ways, one is to disconnect the battery for a few minutes, which will reset everything on the car, or you can just reset the mixture adaptation through SDS, which is my prefered method. I suggest you start with 1.5-2 oz per 10 gallons, and note the change in MPG, if it drops, decrease the amount of acetone, if it improves, you can either stick with it or tweak it slightly to your liking.
Now, there are many opponents to using acetone in your gas tank. Many, if not all of the sceptics, are fueled(no pun intended) by the oil companies, who for obvious reasons dont want the people to use acetone, or even know about its benefits in the engine. Some of their many arguments are that acetone deteriorates rubber in your fuel system. This is somewhat true, as acetone does alter the composition of rubber, but slightly, and at full concentration. The concentration of acetone in your gas tank is much, much lower than that needed to deteriorate rubber, which would take many years, possibly decades for acetone to destroy rubber hoses in your fuel system, by which time that same rubber hose will fall apart on its own.
But I have to say, try and use acetone in your gasoline at your own risk.

 

22-25 hwy
15 city

I average ~17 due to living in the city

 

When I was in California: 13mpg city too many red lights, short streets.

Phoenix: 17mpg/city 22-24 on freeway. Pedal to the metal until speed limit, then cruise.

o.t. : mikey, what area in az? PHX, by Arrowhead here.

 

I am in the east valley in Gilbert which is a ways from Arrowhead. You just move to Phoenix recently?

 

Yep.

 

How do you like the heat compared to California? I do not even notice it since I have lived here my whole life.

 

 

Exactly where I'm at with my mods too.

 

13 to 14 city driving

 

i dunno about city-- cruising on the freeway near speed limit 23-24mpg .... I just cruised LA to Vegas @90 and got 20mpg --- and you can see my mods -- mild tune

 

13-14 mixed driving, I once hit 21mpg driving 50mpg.

 

My display shows 14.5mpg, average speed 24mph, since last reset 7000 miles ago. At 70mph I get ~21mpg.

 

9mpg city, 19 hwy.

 

Me about 13, my wife about 16.

Prius = good mpg
E55 = great fun

Never the twain shall meet.