[RedDevil]

Like Cowmeat I got most of the data I need from my car already so my UltraGauge, though nice to have, is not the biggest gain (in itself).

Airing up the tires was. Going from 2.4 Bar to 3.0 (42 psi) did raise my economy by more than 5%.

The lower and upper grill block add a few %, but you need to monitor engine and air intake temperature with that - in comes the UltraGauge.

I made a wing shaped sleeve for my antenna stalk: a solid 0.01% improvement

My HIDs use 40 Watts less than the halogens they replaced and make sure I get enough light from my HID approved but slightly inefficient projector headlights.
I reckon the gas savings is some 20 CC per hour used; say a gallon in 200 hours.

I foam taped the seams, cannot guess what that saves me but wind noise is reduced.

Ultra thin Green Oil did not have much effect until the cold season arrived; now it saves me some every cold start.