How would you build a low 10’s street car

It's good that you're trying to think outside the box, but unless you get something like a new Demon, Hellcat, or Shelby, it's gonna be difficult to build a 10 second street car...

Then anything that can run 10 seconds is not going to get good MPG....
Yeah that’s understandable I figured a lower numerical gear to help with mileage along with the gear vendors unit hooked up with my four speed to try and get decent mpg when keeping my foot out of it, just looking for above 10mpg maybe 12mpg lol nothing outstanding