always getting passed on highway ?!!?

[JakeP]

Odometers read over the actual speed so that you can't use the manufacturer as an excuse for speeding.

[Ian Bowers]

I've noticed every E30 I've owned/driven (a whopping 3) has been around 2-3 mph off at 25, 5mph off at 45, and 5-7mph off at 55-70. I cruise at 75mph and my GPS speedo says I'm doing 70mph. I cruise at 62mph and my GPS speedo says I'm doing 55.

[unrlmth]

I've noticed every E30 I've owned/driven (a whopping 3) has been around 2-3 mph off at 25, 5mph off at 45, and 5-7mph off at 55-70. I cruise at 75mph and my GPS speedo says I'm doing 70mph. I cruise at 62mph and my GPS speedo says I'm doing 55.

Mines within 1-2 mph of my GPS, stock tire size, I think. Speed signs are about the same as well.

[Ian Bowers]

All of the speed signs from here to Los Gatos agreed with my GPS speedo. No clue why the 3 cars I have are so off, lol.

(91 318iS, 91 318i, 88 325iC)

[EN318isPDX]

Seems all E30s are around 5 mph under. If im going 65 i keep up with people doin 60, im running 15s with my stock wheels it seemed more off, like 7-10mph

[a3ternus]

M10 w/ 4.27 here.100km/h is really 91km/h (62 is 57mph).
N.

[e30littlechris 22]

Eh I usually brake check them by pulling up the parking brake so it doesn't show light's and by any chance one day they crash into me I'm going to say didn't you see that dog in the road lol

[87-325ic]

I've noticed every E30 I've owned/driven (a whopping 3) has been around 2-3 mph off at 25, 5mph off at 45, and 5-7mph off at 55-70. I cruise at 75mph and my GPS speedo says I'm doing 70mph. I cruise at 62mph and my GPS speedo says I'm doing 55.

right.

this is why i never got a ticket in my e30, til my speedometer broke.

[bmwstephen]

i have one of those "baby on board" stickers on my rear windshield. definitely noticed that no one tailgates me anymore, unless its some dumbass in an SUV who either cant read english or their car is so damn high for them to notice