"ravelation" <ravelation@webtv.net> wrote in message
news:19168-3F818147-83@storefull-2336.public.lawson.webtv.net...
> As we didn't mount the wheels, I am guessing the speedo gear
> wasn't changed when the new wheel and tire size were mounted, so the
> actual mileage may be off from that, as well.

Assuming the correct tire size was chosen for these larger rims, the
speedo/odo should not be affected. Althought your gas mileage will be
affected as the larger rims are most likely heavier and have a larger
contact patch (higher rolling resistance).


> Also, can you get a true reading of MPG when you fill up at half a tank?

No. How do you know you're at half a tank? By looking at your fuel gauge?
There's no way you'll get an accurate measurement that way. Fill up with
gas. Drive. Fill up with gas again. Then divide miles driven by gallons
purchased (at second fillup of course).


> The reason I ask is it always seems like the first half of the tank is
> used more quickly than the second half? Myth, or true?

Quite possibly. The fuel gauge is just an estimate at best. It's not 100%
accurate. That's why you cannot calculate gas mileage based on it.

Cheers,

Pete