fuel efficiency question

[bigvxfan]

thanks...
i have a 30 miles commute on a rural highway with twisty roads....
even on empty roads, it is very rare that i will drive 10 over posted limits
how do these facts change the equation??

[Elric]

Somebody had a calculation stating 20-22mpg at 55mph speed that was proven in real driving. Cruise controls helps naturally. Twisted roads though worsen the situation so, I guess, 16-18mpg depending in AC use/winds/etc...I am sure others can give more detailed answers...

[Cabana Boy]

Only had mine for a week, and had the same concern, especially since ours is supercharged....Filled it on the way home just this morning; 224 miles 13.42 gallons. About 16.5mpg. Very little highway, but lots of 45 and 50 mph rural twisty roads, as I must follow a shoreline to get the boy back and forth to school, practices etc. Sure I'm a bit of a lead foot too since its new to me, and my son is always egging me on. I'd guess one could add one or two mpg to the above without the forced intake. All in all I'd say thats pretty good. Could probably get a few again better with some nondescript SUV but choose not to. Good Luck!

[VehiGAZ]

BigVXfan, count on 2 gallons each way as an all-year average, and you'll be close enough. Your best mileage will be come when you're running in the 50 mph range, which is what you will probably be doing, judging from your description of the roads.

[Chopper]

averaged just a tick better than 21 this last tank---best yet. This is flat Fla., and most is done at 50 or so on rural roads, with Mobil one lubes everywhere,and K&N filters,etc. etc. . Still 21 overall ain't bad. Hitting it's groove now (20000 miles) I guess. I was getting like 13 at first. That was a little distressing, considering what I could be driving in that milage range

[Elric]

would you attribute improved fuel efficiency to Mobil 1 oil and different air filters?

[ZEUS]

I seem to get around 13 all the time - in town, and traveling down the highway with cruise control in a headwind (it's Wyoming)! It's driving me crazy and broke. I have drastically reduced the lead portions in my foot because of it, so it looks like this tank might give me 15 mpg if I'm lucky. The reason I didn't buy a Sierra Denali with 4-wheel steering is because I was worried about the fuel consumption - they get more like 18 come to find out! That is from a 6.0 V8!!! What gives? I should be getting 18 mpg from a 3.5 V6 with 40,000 miles, easy! Anybody out there have suggestions on how to improve my mileage or what problems to check for that could cause such horrible "efficiency"???