I've seen very mixed fuel mileage out of my RL over the last few months. Obviously highway MPG is far better than city. The best I had seen to date was 26mpg during highway driving. I know that is what it is rated for by the EPA and I think 18mpg city. I generally see 24-26mpg on the highway and anywhere from 16-19mpg in the city depending on how bad traffic is. On the way home from Colorado Springs to Denver tonight it climbed all the way up to 29.8mpg while averaging about 80mph. Not too shabby IMO. I was impressed.

 

WOW i didnt know the RL gives such gas mileage....on my TL I get 33mpg on the highway and 24-25 city....

now if I hit VTEC couple times, everything is down to single digits....

 

On average, I get about 22mpg in the city and 28-29 on the highway. I always use premium gas and put Lucas fuel cleaner in every 3 months.

 

^^^ try seafoam...

I used to put 1/2 can of seafoam in less than 1/4 tank of gas (cleans injectors and lines)...1/2 can in the vac port (cleans TB and butterfly etc)....1 can of seafoam in the engine oil case....

Drive for around 50-100 miles.....then do an oil change....

 

That's pretty good mileage. I bet some of it is because after Monument "Hill" at 7343 feet, it's mostly downhill to Denver. I've done the drive many a time myself since I'm out in Colorado a lot.

 

I did 13.5mpg average this week. (Too heavy on the pedal?)

 

^You're a racer, what did you expect.

Driving back from Houston, I was getting 26-27 going due west with wind coming from the NNW. Then I turned to go NW, it had me down to 23 by the time I got home. 75 mph average the whole time.

I've averaged 19 before going into a 20-30 mph headwind trying to maintain 75.


(I'm a racer too! :wink

 

I usually get 18 around town and about 26 highway but I did get 30 once, on the Atlantic City Expressway from Philly to AC. The wind must have been behind me.

LL

 

My 2006 RL is getting the best mpg seen in its 88K miles. My son reports his 2002 RL with 170K miles is also getting its best gas mileage these days. You've guessed it, we're obviously seeing 100% gas/0% ethanol the last several months as the cause for our cars getting better gas mileage.

 

It's been several months, but returning to Dallas from Colorado I averaged almost 30mpg for over 700 miles.

 

My Thanksgiving trip was 396 miles each way
Outbound average speed = 68 (included stretch of 10 miles of stop and go, so most of trip was 75+)
MPG = 23.2

Return ave speed = 69 (only 1 5 mile stretch of stop and go)
MPG = 24.3

 

After I refuel, at 1 time I can get 100MPG for 1 second, but it quickly drop down. Also 1 time I get as high as 30 MPG and then never see it again. That was driving 55 MPH on I95 here in Northern Virginia. Again after refueling. That is with 2006 RL

 

70mph with no traffic seem to be the sweet spot for me.

if I have to maneuver/lane change or maintain 80+ the MPGs suffer.

 

Speed can definitely be a killer along with wind and hills. I have averaged 27 mpg through the hill country with an average speed of 70 on pure highways, but I was really milking it by coasting down the big hills. I really think if you could go 55-60 on flat ground with no wind, 30 mpg could be a consistent average. 45-55 in fifth gear gets some good numbers too, but it is way to slow for a long distance.

 

i averaged 11.6 but thats probably because of speeding and traffic =/

 

A lot has to do with cooler air= more dense air= a cleaner combustion. This means more power/rpm so it takes less rpm to maintain the same speed as during summer so less fuel being used.

 

Colorado's thinner atmosphere offsets this cooler air theory though. Bandimere Speedway generally sees some of the slowest 1/4 mile times of any of the premier drag strips in the US. One thing that does help though, that same thinner atmosphere creates less drag on the car at highway speeds.