I dunno whats going on! I put new wheels/tires on my car recently, mabey thats causing it? Anyways my speedometer will say im going 70 for example but I drove past one of those signs that say how fast your going and it said I was going 63-65 when I thought I was going 70.

I thought mabey it was just the sign so I drove past one of the new civics with the digital speedometer and his said 53 and I was going the same speed as him but my speedometer said I was going 60.

Also it will say I have a half tank of gas and then randomly drop to a quarter than stay there for a while and go back. I never know how much gas I have, and it's frustrating for long road trips! How can I fix this?

 

What size are your tires? there probably too big? 17''? for the gas problem, i think hills and stuff mess with the sensor so it will cause it to go up and down, but make sure your not drivin like an ***, lol easiest way to fix that problem

 

16" with 205/40/r16

 

what car, year, and model ? what is your original tire size?

use this calculator.. http://www.miata.net/garage/tirecalc.html

it will tell you how off your spedo is

 

in my experience, honda speedos are generally off atleast 4-5 mph. With your wheel size it shouldn't affect it too much, maybe 1-2 mph which would put you right about in the range.

 

1996 civic DX hatch