anyone go from run-flats to non run flats
Junior Member
Joined: Dec 2018
Posts: 20
Likes: 2
2017 C63S AMG coupe
No spares any more, in general. Cars come with a tire repair kit - or you can purchase one when you go from run flats to standard tires. The kit includes a small compressor that you use to pump in a sealant. I went from Bridgestone RFT to Michelin Pilot Sport 4s on my BMW Z4 and purchased a repair kit at that time. It's much smaller than a spare.
Senior Member
Joined: Dec 2016
Posts: 343
Likes: 43
E250 Diesel
From what I know DEF tanks in Europe just come on the market and the cars are still on warranty. Meaning you won't see the owners coming to forum for advice for some time..
Than bare in mind in Europe you don't have 1000 km distances with no tire shop having the size, like we do in USA.
Frankly I inspected my DEF tank very closely and it doesn't take much reengineering to make space for compact spare on top of it.
MB made big DEF tank that doesn't need filling for 20,000 km between oil changes. I fill up DEF in my Ford every 3000 miles and don't see a problem with it.
So my final conclusion is that MB engineers got lost a bit designing stuff for USA smog requirements, while they don't even drive those cars in Europe.
Than bare in mind in Europe you don't have 1000 km distances with no tire shop having the size, like we do in USA.
Frankly I inspected my DEF tank very closely and it doesn't take much reengineering to make space for compact spare on top of it.
MB made big DEF tank that doesn't need filling for 20,000 km between oil changes. I fill up DEF in my Ford every 3000 miles and don't see a problem with it.
So my final conclusion is that MB engineers got lost a bit designing stuff for USA smog requirements, while they don't even drive those cars in Europe.
Thread Starter
Senior Member
Joined: Apr 2006
Posts: 436
Likes: 36
From: Barrington IL
2015 E 250, 1999 BMW M Roadster, 1939 International Harvester, 2023 GLC
I can tell you after 6 months of non run flats fuel economy suffers by about 10%. RF must roll better
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Joined: Jan 2009
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From: V E G A S
1922 Ford Model T / no OBD
RF have stiffer walls, what lowers rolling resistance.
You can still get the same by adding +- 10 psi to standard tires.
Tire choice is always compromise.
Than winter temperatures and in some states winter fuel blend do lower mpg quite visible. You Illinois guys did have some chills lately?
You can still get the same by adding +- 10 psi to standard tires.
Tire choice is always compromise.
Than winter temperatures and in some states winter fuel blend do lower mpg quite visible. You Illinois guys did have some chills lately?
Thread Starter
Senior Member
Joined: Apr 2006
Posts: 436
Likes: 36
From: Barrington IL
2015 E 250, 1999 BMW M Roadster, 1939 International Harvester, 2023 GLC
for sure the winter blend is less fuel efficient. My best MPG is on hot summer days.
It was so cold at one point I put fuel conditioner in my tank to avoid being stranded. This is my 2nd Mercedes diesel first time adding this stuff. -26F there were many report of dead trucks
Not sure I'll go up 10 psi I do not want the poor ride again
It was so cold at one point I put fuel conditioner in my tank to avoid being stranded. This is my 2nd Mercedes diesel first time adding this stuff. -26F there were many report of dead trucks
Not sure I'll go up 10 psi I do not want the poor ride again
