Fuel trim - How high is too high?

Legojon

I only wanted a remap
Staff member
Moderator
Jul 7, 2015
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So.... same as a few other guys on here, I've been trying to figure why my MPG is so low. 18mpg urban, best on a motorway run of 23.8mpg (calculated from litres at pump and actual miles driven).

With just the Stage 1 map, my LTFT was 7%. After fitting a Revo intake it moved up to and settled at 10%. I fitted a new PCV and coil packs a couple of days back and LTFT instantly jumped to 13%. I reset it and drove it around the last couple of days and its quickly worked its way back to 13% again. Did I do something wrong? Is 13% too high?

In other news, town / dual carriageway / traffic the last couple of days I got 24mpg. So best yet. Taking it on the motorway Friday (fingers xed).

Oh... and scanned for codes, all clear... and misfire count 0 on all cylinders. So least that's something.
 
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Legojon

I only wanted a remap
Staff member
Moderator
Jul 7, 2015
5,284
2,713
Oh... might this have something to do with it?

dCVUofI.png
 
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