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![]() | Home > Technical > 5.0 Supercharged sudden drop in mpg |
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Camelrock Member Since: 31 Aug 2013 Location: North Yorkshire Posts: 1003 ![]() ![]() ![]() |
Even though only warning light might be worth getting the codes read, any warm wheels after a run indicating a sticking brake ? 2008 G4 RRSport TDV8 current
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DAVE-W- Member Since: 06 Feb 2011 Location: Glasgow Posts: 5 ![]() ![]() |
I haven't noticed any binding from brakes. It's worth checking as may be contributing to a drop in economy. The other thing I noticed was that the idle didn't seem as smooth after the service so there must be a cause to a drop in mpg and slightly rougher idle. The warning lights on 2 occasions may or may not be linked to the issue or just coincidence |
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Andrew Member Since: 16 Jun 2005 Location: Cheltenham Posts: 248 ![]() ![]() ![]() |
Running rough on idle, like the choke is out on an old car ?
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DAVE-W- Member Since: 06 Feb 2011 Location: Glasgow Posts: 5 ![]() ![]() |
When I say rough idle its very faint. The revs are low(normal) and stable but you can feel a very slight movement/shudder in the vehicle. Would diagnostic equipment pick up on a potential temp sensor issue if there are no dash lights showing an issue? |
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drdelrrs Member Since: 02 Nov 2010 Location: UK Posts: 1163 ![]() ![]() ![]() |
Have you actually measured the drop or are you basing it on what the onboard info. says?
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Col Member Since: 02 Sep 2012 Location: Hawkes Bay NZ Posts: 5046 ![]() ![]() ![]() |
Only ever get around 200mls. to the tank full on mine, which works out about 13-14 mpg. on average. Did check once out of curiosity after long run and it showed 17.3 mpg. Have never tried driving like "Miss Daisy" to see what it will actually do though.
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