Moderator: volvite
zymol75 wrote:I get 21mpg on my 99 3.3 2WD. It has an 18 gallon tank approx. I use premium all the time and I drive a lot. lots of highway and city. I've got 215k miles on it. I keep the plugs original Nissan spec. the Air filter is K&N and the wires cap rotor belts and such are all Nissan spec. as well standard intervals for change. i havea roof rack on all the time and a stage 3 hitch and airbags in the rear. I get 245 miles to a tank consistant. I change the rear diff fluid with synthetic 85w90 every 30k. I do a full trans filter/fluid svc every 30k too. I keep my tires at 38 psi and they are oversized from a Toyota Tundra which gives me 3 more inches of clearance.
I think the difference I see may be due to less weight from a 2WD but the over sized tires should offset that ...so who knows.
As a comparison my wife's 99 QX4 gets 15mpg at best with stock tires but same engine and all other things being equal.
I found a calculator online that tells you the difference in speed based on original tire size and what ever the new is and it took a huge difference in tire size to make a significance in speed. I have always heard that it makes a difference, but apparently not anything worth noting....which is good for all of uszymol75 wrote:Oh I had my brother, (a Sherriff) clock me in his HCSO cruiser and my speedo is not off more than like 2 mph. I thought it would be more, but it's not.
zymol75 wrote:I get 21mpg on my 99 3.3 2WD. It has an 18 gallon tank approx . . . I get 245 miles to a tank consistant.
Your math does not seem to add up. Say you get 21 mpg, and by safely driving with the gas light on you mean you fill with let's say 1/2 gallon left. 38 miles at 21 mpg would mean your gas light came on with approximately 2 1/4 gallons left (1 3/4 gallons + 1/2 gallon left at station). That means you would have put about 15 3/4 gallons in your tank before your gas light came on. If you were getting 21 mpg your trip meter would read 330.75 miles (15.75 * 21 = 330.75) if you filled before your gas light came on.zymol75 wrote:I usually can go 38 miles safely with the low fuel light on and I've only broken into the 300's a few times. Also I find if I keep it under 70 my mileage goes way up. I usually drive at least 85 on the highway from Brooksville to Tampa.