ahh.. good to hear i'm not alone.

 

Wow, I don't see how you guys get such low mileage in the city! I don't baby my car but I don't race from stoplight to stoplight either, and have no problem averaging around 18 MPG in mostly stop-and-go, all under 50 MPH traffic.

 

Do you have 3.31's or 3.55's? Not sure how much a difference that makes..

 

3.31's

 

No so.I'm from Denver,CO and pulling 28MPG in the mountains and surrounding areas.

 

I don't have a trip computer, but I do have Progressive's TripSense that monitors your speed and distance that you drive. Based on that data, along with my fuel economy data, I have determined that city driving yields 17 MPG and highway driving yields 27 MPG. I have the optional 3.55s, and I cruise on the highway at 70 MPH w/ the A/C running full blast during the summer. I use Meijer 87 octane fuel, and the car is stock except for the stuff listed below (none of which would affect MPG).

Bottom line: Hot ****, I don't see any reason to downgrade to some Prius POS.

 

I was wondering the same thing myself. Does anybody know?

 

I'm curious also. I don't have the trip computer my Mustang, but in my previous car it always seemed to be off by 1 - 1.5 MPG.

 

I do it the old fashioned way: pencil and paper.

 

The key word is driving 55 MPH. What were your engine RPMs at that speed? The pumping losses and frictional losses from the motor at greater than 2000 RPM contribute to significant fuel consumption.

 

I'm pretty sure it measures fuel used. It's no more or less accurate than the fuel pump and tripometer.

 

I couldn't tell you because this was close to 5 months ago, and I really haven't driven the car much since the end of July after I started my new job, but I would say I typically stay under 2500RMP's on the highway.

I have only put 1,000 miles on it since July of 08. A good chunk was going/coming to Virginia Beach and back. I have about 12,000 on her now...not too shabby for a 16 month old car. She's been sitting as I drive my daily driver 2004 Ford Focus ever since I picked her up in June of 08. I still have some mods sitting that I haven't had a chance to finish yet. I just recently installed a brand new audio system in there. Pioneer AVIC-F900BT, Polk Audio front and rear speakers and a MTX ThunderForm4500 for the trunk. It's badass. Before the summer, I should have Long Tube Headers and the FRPP Hot Rod Cams in there.

 

I am consistently in the 19mpg range, decent driving mix (not all stoplights, but not all highway either). That is tuned, with 4.10's, wide/heavy tires, and a heavy right foot atleast once per trip.

As far as the questions about the car's mpg reading, I keep track of my gas in a spreadsheet and compare manually calced mpg to what the computer says. The computer averages .1 of a mpg worse than actuals.

 

I consistently average around 21 duing the week and I live in dallas,I drive a lot on the highways and dont hit too much traffic. On the last 3 road trips I have taken (2 from dallas to austin and 1 from dallas to houston) I averaged 29-31 mpg on the highway. Cruise set at 73-75. I have the 89 torque tune in it right now and JLT.

 

Mods below, AC off, 91 octane, 70-75mph... computer reads 22 mpg.

Not bad considering.