Tuned mpg??
Thread Starter
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Joined: Oct 2022
Posts: 8
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2014 e550 sport, 2011 e350 wagon sport, 2007 e550 luxury, 2008 e350 sport
Tuned mpg??
Hey everyone, I’m hoping to get some information from a few of you who have different software…
All of these tune companies advertise their hp and tq numbers, which are all pretty impressive as far as gains over stock. But I’m curious what type of fuel economy everyone is getting in their 550’s and which tunes you’re running.
My brother has a kleeman tune, and from what I understand the power gains are not quite as impressive as weistec or renntech, but he averages 31mpg on the highway and it’s incredibly fast. While a friend of ours has the renntech, and makes huge power but he said his fuel economy isn’t much better than stock.
I know this is all relative, and has a lot to do with the way the car is being driven, but I thought it would be a good idea to check in here and get some real info from some of you prior to making a purchase. I drive a ton for work, and decent fuel economy wouldn’t necessarily be a bad perk on top of all that extra power.
All of these tune companies advertise their hp and tq numbers, which are all pretty impressive as far as gains over stock. But I’m curious what type of fuel economy everyone is getting in their 550’s and which tunes you’re running.
My brother has a kleeman tune, and from what I understand the power gains are not quite as impressive as weistec or renntech, but he averages 31mpg on the highway and it’s incredibly fast. While a friend of ours has the renntech, and makes huge power but he said his fuel economy isn’t much better than stock.
I know this is all relative, and has a lot to do with the way the car is being driven, but I thought it would be a good idea to check in here and get some real info from some of you prior to making a purchase. I drive a ton for work, and decent fuel economy wouldn’t necessarily be a bad perk on top of all that extra power.
Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
"...he said his fuel economy isn’t much better than stock."
Wow! What did he (or you) expect? I have a SL400 with a Stage 2 tune from vividracing and on the highway at 70mph with the cruise control in Sport mode, I have gotten 32mpg or better. Stage 2 produces 422hp. Around town driving, is much different, probably a little better than half that. As you said, it all depends on how you drive. Anytime you don't suffer mileage with a tune is good.
Wow! What did he (or you) expect? I have a SL400 with a Stage 2 tune from vividracing and on the highway at 70mph with the cruise control in Sport mode, I have gotten 32mpg or better. Stage 2 produces 422hp. Around town driving, is much different, probably a little better than half that. As you said, it all depends on how you drive. Anytime you don't suffer mileage with a tune is good.
Thread Starter
Newbie
Joined: Oct 2022
Posts: 8
Likes: 0
2014 e550 sport, 2011 e350 wagon sport, 2007 e550 luxury, 2008 e350 sport
"...he said his fuel economy isn’t much better than stock."
Wow! What did he (or you) expect? I have a SL400 with a Stage 2 tune from vividracing and on the highway at 70mph with the cruise control in Sport mode, I have gotten 32mpg or better. Stage 2 produces 422hp. Around town driving, is much different, probably a little better than half that. As you said, it all depends on how you drive. Anytime you don't suffer mileage with a tune is good.
Wow! What did he (or you) expect? I have a SL400 with a Stage 2 tune from vividracing and on the highway at 70mph with the cruise control in Sport mode, I have gotten 32mpg or better. Stage 2 produces 422hp. Around town driving, is much different, probably a little better than half that. As you said, it all depends on how you drive. Anytime you don't suffer mileage with a tune is good.
To answer your question, I was expecting someone with some experience with tuned 550’s to give me some real world numbers relative to the tunes they have installed. And I can’t speak for my friend. I’d imagine he expected similar numbers that my brother found in his car.
Im aware that mileage can vary greatly, and potentially be worse than stock. Being that I drive about 50k a year, it’s something that I’m going to consider while shopping.
while I appreciate your response, you didn’t really give me any info that I can use. As I don’t have a 400. And you didn’t even mention which tune you have.
have a great day.
Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Actually, "Stage 2 tune from vividracing" is the tune I have. It's also called their vtune. That said, I think my comments are relative since the same principles apply. These engines seem to take well to tunes since a lot of other brands seem to suffer mileage with a tune. Boosting my hp 89hp on a stock 329hp engine with no loss of gas mileage is a good measure. While I like my tune, I'm sure most off-the-shelf tunes will give you similar results.
