tappers Posted May 23, 2006 Report Share Posted May 23, 2006 I have a 2001 Passat 1.9TDi 130, it has about 93 - 94K on it. Recently I have noticed that I can only get around 270 or a bit less out of half a tank and the MPG on the computer is around 32, I am sure it was better than this!! It is an auto/tip by the way! I spoke to shark_90 who has his lovely 1.8T quattro and his was close if not better than mine on mpg! should I consider changing to one?? Is there anything it could obviously be other than heavy right foot which I am sure it is not!! Link to comment Share on other sites More sharing options...
Rustynuts Posted May 23, 2006 Report Share Posted May 23, 2006 Check: Tyre pressures are all correct. Tyres are not scrubbing off on the front. Change filling stations? (they might be pumping air instead of diesel). Link to comment Share on other sites More sharing options...
shark_90 Posted May 23, 2006 Report Share Posted May 23, 2006 32.6mpg, 32.6 mpg, 32.6mpg Link to comment Share on other sites More sharing options...
pritesh Posted May 23, 2006 Report Share Posted May 23, 2006 that does not sound good at all...I have a Passat (45K on the clock) 1.8T 20V sport which is a Tiptronic and I can do over 35mpg every time. Sounds daft but are you carrying stuff in the boot? when was the car last serviced? do you boot it everytime you launch off the lights and on the motorway? Link to comment Share on other sites More sharing options...
pritesh Posted May 23, 2006 Report Share Posted May 23, 2006 shark_90 whats the excat model and spec of your motor? just out of interest pls. cheers P Link to comment Share on other sites More sharing options...
SteNova Posted May 23, 2006 Report Share Posted May 23, 2006 went out in a chipped and modded 1.9 130 last night didn't go under 35mpg.... and it's 190bhp Link to comment Share on other sites More sharing options...
alexc Posted May 23, 2006 Report Share Posted May 23, 2006 [ QUOTE ] I have a 2001 Passat 1.9TDi 130, it has about 93 - 94K on it. Recently I have noticed that I can only get around 270 or a bit less out of half a tank and the MPG on the computer is around 32, I am sure it was better than this!! It is an auto/tip by the way! I spoke to shark_90 who has his lovely 1.8T quattro and his was close if not better than mine on mpg! should I consider changing to one?? Is there anything it could obviously be other than heavy right foot which I am sure it is not!! [/ QUOTE ] 270 miles for half a tank, 540 to a full tank, what's so bad about that?? How many miles should you be getting from a full tank then? Auto/Tip boxes always drink more than a manual box will. Link to comment Share on other sites More sharing options...
tappers Posted May 23, 2006 Author Report Share Posted May 23, 2006 tyres seem ok, maybe it is down to the change in alloys from 15" standard to 18"??? I do carry some stuff in the boot, but the fuel consumption seems to have got worse but I have not changed what I carry in the boot for years! I would't have said that I was that heavy off the lights!! sometimes but not that often!! Alexc, I know where you are coming from, but this is something that has only happened recently that it has got worse! I used to be able to easily get over 300 miles out of the first half of tank but now lucky to get 270 Also it is not a case of 270 for half and 540 for full as the last half of the tank goes much faster than the first! Link to comment Share on other sites More sharing options...
pritesh Posted May 23, 2006 Report Share Posted May 23, 2006 your change in Alloys could possibly have had an effect its a big jump from 15" to 18"s. Link to comment Share on other sites More sharing options...
alexc Posted May 23, 2006 Report Share Posted May 23, 2006 I understand, I was just giving an approximate estimate, best thing to do is monitor it for two or three tankfuls and see what happens, I think the wheel size change also has something to do with it as bigger wheels do affect your acceleration, therefore, you're probably applying more boost to get the same feel as you did with the smaller wheels. If you did a 1/4 mile sprint with both sets of wheels you'd notice a difference in the times! Link to comment Share on other sites More sharing options...
Pastit130 Posted May 23, 2006 Report Share Posted May 23, 2006 The rolling daimeter should be similar though as the bigger wheels have rubber band tyres. Shouldn't make a huge difference if the tyre/wheel combination is matched properly. I have an 83k mile 130/tip which gives about 32-34 average with mostly town driving. On the motorway it'll pop along showing 50mpg. Getting it remapped on Thursday... Link to comment Share on other sites More sharing options...
davd Posted May 23, 2006 Report Share Posted May 23, 2006 Bigger wheels mean they will not rotate as many times a mile as the 15 inch ones so the speedo and computor will show a lower reading tan you are acualy doing Link to comment Share on other sites More sharing options...
Rustynuts Posted May 23, 2006 Report Share Posted May 23, 2006 The mileage drop is down to the bigger wheels! What you've done is moved the weight of the wheel further towards the outside diameter and this increases the amount of power / torque needed to turn the wheels. It's got nothing to do with the overall size of the wheel / tyre combination provided you sized them properly as the actual diameter should be unchanged and the speedo will be reading as it should. Link to comment Share on other sites More sharing options...
alexc Posted May 23, 2006 Report Share Posted May 23, 2006 [ QUOTE ] The rolling daimeter should be similar though as the bigger wheels have rubber band tyres. Shouldn't make a huge difference if the tyre/wheel combination is matched properly. [/ QUOTE ] If you're only moving up an inch then that might be the case, but if you're going from a 15" wheel to an 18" wheel, despite having lower profile rubber there will still be a difference. Link to comment Share on other sites More sharing options...
A3Floyd Posted May 23, 2006 Report Share Posted May 23, 2006 It doesn't sound too bad to me. My A4 tdi130 is returning 550-600 miles to a full tank. I noticed the economy dropped when i put the 18 inch alloys on - something to keep in mind. if i drive like miss daisy, i may get 650-700 out of a tank but never more than that. Link to comment Share on other sites More sharing options...
Pastit130 Posted May 23, 2006 Report Share Posted May 23, 2006 Aha, never considered the weight aspect. Thickie me! The correct tyre fitting results only in a 0.1% circumference change even going to 18" rims (1.87m to 1.89m) Tried it on this calc thingy... http://www.race-technology.com/WebPage/Utilities/GearCalculations/wheel.html Link to comment Share on other sites More sharing options...
alexc Posted May 23, 2006 Report Share Posted May 23, 2006 the circumference on an average 15" wheel is 1.77m and if we use 1.89m as an approximate circ for an 18" wheel then there is a difference, which over a few thousand revolutions will affect your consumption, also weight is a consideration as you've mentioned. Link to comment Share on other sites More sharing options...
Pastit130 Posted May 23, 2006 Report Share Posted May 23, 2006 Standard fit on my 130 tip is 205/60 15 which is a circumference of 1.89m. Link to comment Share on other sites More sharing options...
alexc Posted May 23, 2006 Report Share Posted May 23, 2006 [ QUOTE ] Standard fit on my 130 tip is 205/60 15 which is a circumference of 1.89m. [/ QUOTE ] I see, I was working off the assumption that the 15" wheels had 50 series profiles. Link to comment Share on other sites More sharing options...
Pastit130 Posted May 23, 2006 Report Share Posted May 23, 2006 Hey, I had to look twice too! Link to comment Share on other sites More sharing options...
tappers Posted May 23, 2006 Author Report Share Posted May 23, 2006 I was wondering on the side of the wheels! When they were fitted they put the old ones up against them and there is very little in it given that the 18's are lower profile and with the aid of road angel the speedo has barely changed. I think I will see how it goes over a couple of tank fulls and take it from there!! I think I have to go to the garage anyway as there is a funny noise when braking anyway!! Link to comment Share on other sites More sharing options...
shark_90 Posted May 25, 2006 Report Share Posted May 25, 2006 [ QUOTE ] shark_90 whats the excat model and spec of your motor? just out of interest pls. cheers P [/ QUOTE ] Hi mate, my car is: A4 (B6) 1.8T GmbH quattro Sport AmD remap, last RR'd at 218bhp Milltek cat back exhaust K&N Panel filter Hyperboost DV RS4 22mm rear ARB Buffalino Black Leather Cruise DIS Centre Armrest Phatnoise And I think that's about it Link to comment Share on other sites More sharing options...
pritesh Posted May 25, 2006 Report Share Posted May 25, 2006 sweeeeet ... serious motor...im considering trading in my passat for an Audi but its a question of finding one with the GmbH kit. Link to comment Share on other sites More sharing options...
shark_90 Posted May 25, 2006 Report Share Posted May 25, 2006 It was a cost option before 53 plate ish IIRC, after that it was standard on all sports Link to comment Share on other sites More sharing options...
tappers Posted May 26, 2006 Author Report Share Posted May 26, 2006 Didn't you forget something about your Miltek exhaust Not sure I will make it to the Windsor meet after saying that eh shark_90 to your car though Do you know what I am getting at Link to comment Share on other sites More sharing options...
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