gas mileage/tire observations [Archive] - Diesel Place : Chevrolet and GMC Diesel Truck Forums

: gas mileage/tire observations


haneym
03-16-2005, 09:25 AM
observation #1: it appears the 285s have hurt my mileage by approx .5 mpg. before the tires, i was averaging 13.3-13.5 city mileage. the last couple tanks have been just under 13 mpg.

observation #2: for those claiming extremely low mileage numbers, what size tires are you running? after upgrading to 285s, my speedometer/odometer is slower than reality. i filled up this morning and put 21.5 gallons in with the trip odometer reading 256 miles. this would equal out to 11.9 mpg. adjust the mileage by 7% (difference between stock 245s and 285s) and 274 miles gives me 12.7 mpg. dont forget or underestimate this difference.

observation #3: i can definitely tell a difference with the 285s compared to the stock 245 firestones. i still have plenty of power and acceleration, but i used to be able to light up the 245s if i so pleased. ive tried it a couple times with the 285s just out of curiosity and the truck just takes off, no spinning. this is actually a good thing IMO though. sure its fun to smoke em every once in a while, but now i dont prematurely wear the tires and if i want to take a rice burner off the line, i dont have to worry about spinning. i have 285 mud grips and they are much bigger and heavier to turn over than those wimpy little 245 street radials.

just FYI for anyone that cares...

oh yea, as a side note, today is a very sad day. when i filled up this morning, it was the first time in my life i paid over $2 a gallon for gas! :mad: even last year when prices were high, the stations around here (at least some) managed to keep it at 1.99 or lower. this morning, it was 2.01 as my local gate station. -:t

briano
03-16-2005, 09:32 AM
I got rid of my 6.0 HD and got the duramax just because of this.. I had 265's on mine and could never get more than 10mpg period. 260 miles per tank was about max I would get.

as for the price of gas..now diesel is the highest.. catch 22 for me.
good luck

DEWFPO
03-16-2005, 01:49 PM
Don't rule out the effect of the extra friction from your new mudders on fuel mileage as compared to the stock worn tread.

Paid $2.25/gallon for RUL here yesterday.

DEWFPO

JRKRACE
03-16-2005, 03:18 PM
2.02 today for me..and that was Premium..I WISH I got 13 mpg. No matter what I do, I can't break 11....

XTOAK
03-16-2005, 08:09 PM
We're $2.19 here and we produce the stuff just down the road....but, the taxes are the lions share of the $2.19......

Kwilson
03-16-2005, 08:10 PM
On highway with stock tires I get around 19 mpg--Ken

Stove
03-16-2005, 08:42 PM
I am preping my 01 6.0 truck to trade. I have the PCM tuned by westers for the larger tires and performance. I haven't run 245 since about the first 500 miles, but my truck was certainly a little more snappy with the 245's today. With the tune I can shread the stock 245's from a stop, I could the 285's but had to brake torque it. Looking forward to new dmax!!!!!