My GTO was around 3 mpg at the drag strip, but that's a bit of cheating.
Everyday use was my 81 Bronco, which was about 8-10 mpg. Well, at least when it ran.
My GTO was around 3 mpg at the drag strip, but that's a bit of cheating.
Everyday use was my 81 Bronco, which was about 8-10 mpg. Well, at least when it ran.
My father had a small RV (van front, whatever those are classed as) with the Ford V10.
"High sevens, low eights".
Back in the 60s we used to brag about the single digit gas mileage of our muscle cars. Easy when gas was .25-.35 per gallon.
That ended in the early 70s when gas prices went to .75-.80 per gallon and muscle car demand and prices plummeted.
Back in the early 80s, I had a 73 Chevy Cheyenne Super 3/4 ton, 454/turbo 400. Don't know the rear end gear ratio, but I recall that second gear was all done at 65. Wide open at 91 Mph. Usually got 9-10 MPG, and that's when the National speed limit was 55.
I did manage to get 12 with a best ever single tank of 14 on a road trip by holding my speed to 54 mph. I wasn't holding my speed down for the mileage, just trying to keep it at a comfortable RPM.
Starting in Hamilton, Ontario to Orlando straight through, that was a long trip.
edit: my new daily 08 civic got 33 mpg on consecutive tanks running 80 and above, and 31 driving the 180 mile round trip to the Firm, with five autocross runs and four laps in the track sprint.
Towing a 19 ft inboard boat back from Chicago to KC in January in a big Mercury sedan - every 100 miles I put 20 gallons of gas in it - of course this was about 1968.......
Our 2004 Audi Allroad 2.7L V-6 with the twin turbo's got right at 14 when my wife was driving it - of course that's in town. There's a reason I call her "Mario" (as in Andretti - she's Italian)
I drive Minis/MINIs to make up for it! 
Ran my vintage Lamborghini up a local mountain an back - gave it a fair bit of stick (six 40 DCOE Webers) and almost got it into single digit mileage, i.e. equivalent of ~ 10 mpg (Imperial measure).
My big block Chrysler sixpack could get below 15 mpg on a fast tour.
In reply to wspohn :
I borrowed a 440/6 pack/4 speed GTX, driving responsibly (borrowed car) got 7 mpg.
I once got stuck with a U-Haul rental, pretty big box truck with a dead miss in one cylinder. Got around 6 mpg.
Short term, I'm pretty sure my cayman is in the 5mpg range on track. Longer term, RV. But at the same time that mileage is actually pretty impressive for what the vehicle is.
Our E450 22passenger van, 7.3, towing 5000lbs+ open race trailer, at 85mph would get 7mpg. After the Bully Dog we started getting 8mpg!
My 90 F250 super cab 5.8/5-speed got 9mpg on the highway. I was able to bump that up to 11 mpg with some effort
Our old 00 Durango R/T. Got about 15 highway, 10 if towing a car, 8 towing the camper. Was in single digits most of the winter. But it wasnt all bad, it only required Premium fuel.
It's replacement, the 04 suburban generally averages 15ish in a mix of driving. 14 towing a car and 11 towing the camper
Most of my cars average 20-25, but conditions dictate.
Golf R: 7mpg @ 25# of boost.
318 Grand Cherokee: 5mpg towing a 4000#est. CJ7. I would not have wanted to know what the CJ built 304 on 35s got.
'99 2.5RS Subie: 10mpg driven hard
I guess I have never really had a guzzler.
F350 with a 460 and a truck camper will get you 8.
Throw a 35' 5th wheel camper on the back and it drops to 6 mpg at 70 mph.
The worst mileage I have ever gotten out of a regularly driven vehicle was probably my 2.5RS which would struggle to get over 25mpg even babying it on the highway. My Z32 got maybe 1mpg better. I don't recall exactly what kind of mileage my Miatas would get but I don't think either of them ever exceeded 30mpg.
About 0.25MPG driving a newly built car between two shops with, it turns out, a fuel leak 
Don't put 3/8" fuel hose on 1/4" fittings...
Motor home towing a miata on an open trailer. 6.0 4l80 in a 32' class A. 6mpg round trip
Floating Doc (Forum Supporter) said:In reply to wspohn :
I borrowed a 440/6 pack/4 speed GTX, driving responsibly (borrowed car) got 7 mpg.
In a full sized Chrysler I can sure see that. Mine was in a fiberglass British car so a lot lighter = better mileage.
Top tip.
If your trip to work is under 2 miles your car will never get warm enough to achieve any sort of fuel economy and a 2003 Chevy Avalanche will get exactly 7mpg and an R55 mini will hit 20mpg.
Yes I should be riding a bike, instead I keep looking for an electric fortwo.
28 foot box truck with a 454 and 4 speed Allison. It had town gears, not highway gears. At 70mph it got 3.8mpg. Drove to Kansas and back.
I got about 3 mpg on my old Kia Sedona minivan...before I found the leak in the gas tank. I filled up and it seemed like it had only been a day or two since my last fill, so I did the math and thought "that doesn't seem right." Only leaked under use, not sitting in the driveway.
My $500 liberty gets right around 10mpg city, which is all I drive.
In HS, I had a friend with a Chevelle, a 454 and power glide.... it was a burnout machine. The way we drove it I know we got 5mpg or less. Gas was cheap though and there was nothing else to do in West TX.
Worst I've gotten in street use was towing my M3 up to Thunderhill with my Chevy Duramax (LBZ). Enclosed trailer with strong headwinds, I got about 7 mpg on that trip. 180 miles and I actually had to stop about 10 miles short of my destination to fill it up because I was so low on fuel I was worried about running out. That was about 20% worse milage than I normally got towing that trailer with that truck.
Worst for non-towing duties is my FD, it USUALLY manages to break into double digits in street use... :)
Does it count when you just pumped 12gal of gas bc you were out and a half mile up the road your beefy cis fuel pump has pumped it all over the road? If so 0.0416 mpg
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