City Versus Highway
I used to work a job where I drove 25 highway miles each way and was able to go 88 miles after the yellow light came on. Knowing this, I somehow didn't change my mindset when I changed job and was doing more city driving. I ran out at 55 miles once, but it was perfect. Ran out as I was pulling into the park where my wife was playing a tennis match. Called AAA, and they got to me within 20 minutes with 2 gallons of gas. Worked out great, and my wife won the match!
I often use just ordinary sewing cottons for my cards as they give me a very good range of colours and the effect is like painting pictures in cotton. I also use a variety of Anchor, Cralatlsini, Impex and astro brands of metallic threads. I think perhaps it comes down to whatever works for you.