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Do you have the "aero" mods installed on your car?
I have the FSI winglets and the exhaust tunnel cover, but I haven't fitted the subframe spoiler yet (no ramps etc).
Yes, 103hp from 79.
Do you drive very carefully? (i.e., do you cruise along at about 60-65 mph for many motorway miles?)
60 rather than 65, I use a few hypermiling techniques such as 'driving without brakes', 'driving with steady load', a bit of Pulse&Glide (not much, mostly on hills). Google the names for more info.
Do you have the lower ratio 5th gear mod?
Nope
I am quite envious! Oh, I have had my car tuned to 108 BHP and have a 0.681 ratio top gear. I drive at about 70 mph, usually. (Sometimes a bit slower.) My Scanguage is usually then showing ~60 mpg. I would just be happy to regularly get back to my 10 pence per mile!
I also have a scangauge, although I have it currently set up to display miles/litre in order to save time doing conversions when entering the data after refuelling. What settings do you have?
For reference, my settings are : DieselA, 1.4L, +3% speed factor, fast updates, miles, litres, miles/litre. HP adjust +99% (need +150%), mpg adjustment -41.7%. I would prefer to be using miles/gal rather than miles/litre.
Of the various things above, the motorway/A-road cruising speed has the biggest affect on your MPG. The mods all together only make a modest difference (a few mpg at most). Additionally, it is a good idea to run your tyres hard (say, 40/42 psi front/back), and to use narrow, high profile LRR tyres (keep an eye out for uneven wear if you are running them at nonstandard pressures). I just bought 175/65R15 wheels & alloys from a forum member, but I still need to swap them over with my current 185/60R16s.
As you already identified in an earlier posting, the journey distance is very significant for MPG, particularly in winter when the engine takes a long time to warm up. My daily commute is 27 miles in each direction, what's yours?