New ignition switch fitted - mpg goes up from 42 to 48 mpg!!! - Alfa Romeo Forum
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(Post Link) post #1 of 4 Old 26-09-10 Thread Starter
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Weird coincidence? New ignition switch fitted - mpg goes up from 42 to 48 mpg!!!

Is this pure coincidence? I recently had the ignition switch replaced in my GT as it would occasionally fail to start (no dash lights at all, or dash lights come on then go out).

Since the replacement, I have had absolutely no starting problems but I have found that doing exactly the same daily 140 mile round trip commute (mix of fast A and motorways) my mpg has gone up significantly. It used to average around 42 mpg but has shot up to 48 mpg!!! This corresponds to about 48 mpg and 54 mpg respectively on my GT's trip computer, which is notoriously inaccurate. I have manually checked the actual consumption at every re-fill by takng the amount of fuel needed to fill up the tank to full divided by the mileage done. The 48 mpg is correct which means in financial terms I should save several hundred pounds in diesel costs annually due my very high mileages.

How can this happen? I am not complaining but I could have saved so much over the past couple of years.

Alfa Romeo GT Cloverleaf Q2 170bhp
Alfa Romeo 159 Sportwagon TI Q4 210bhp

Last edited by Intrigued; 27-09-10 at 20:22.
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(Post Link) post #2 of 4 Old 28-09-10 Thread Starter
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Pure coincidence or what? Is the ignition switch connected to anything that could affect fuel economy?
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They probably disconnected the battery when replacing the switch, which could well have done an ECU reset.
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I was thinking exactly that as well Boda.

Likely it will gradually return to the previous figure in due course, unless you start driving gently and teach it to be more ecconomical.

These adaptive ECUs are all very well....but I'd much rather decide for myself how I want the thing to go, by simply modulating the pressure on that thing under my right foot. Progress. Pah.
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fitted , ignition , mpg , switch

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