Fuel Mileage?

The 2V 232 in my 64 Classic with a T35 and  3:15 gears now gets 19 - 20 MPG US. It seems to have improved a lot with a replacement rocker assy and new timing set.  

At least we dont have to work hard at having Jaguar mirrors, as long as our cars came with the hooded sport mirror.

gee, thanks Frank, I think.............

LOL

Steve/biker - geesh, I was pulling a 2,000 pound trailer with my 4x4 and got 14-14.8 going to Indiana - once I left the hills of Iowa. On the way back, not so great....... well, someone shoved a car full of parts onto my trailer while I wasn't looking and stuffed parts in the back seat and box of my pickup.
Actually, Steve, I'm funnin' ya - that's NOT BAD for that car at that speed. I've be PLEASED if my Javelin approached that. 12-13 mpg just kills me when I must buy premium just to get by.

My Eagle (SX/4) does a range of 19-24 when COMMUTING, which is a mix of 2/3 40 mph and 1/3 in town stop and go.
On the highway, 55 mph, I've approached an average of 30. Driving REALLY fast (for an Eagle, that is) I get 19. 65 it's mid 20s.
The tires on it are a tad smaller than factory spec - reason is I have the lower profile, same size, but a 60% not a 65% The speedometer is thus about 1  mph off at highway speeds - the speedometer says 65 but the GPS says 64. Yes, that skews the MPG numbers a bit. I want to put the correct size tires on it, a bit taller is how that would end up, as the small diameter tires look too small for the large wheel openings in an Eagle, and that would put my speedometer readings about right if my math is right. How will that impact MPG? I guess I'll find out......
I found that how I drive the car has huge impact - like farna said earlier, my best mileage with the truck or Eagle is speeds under 65. Once I cross that, it drops.

We did 65-70 with the Jeep to Overland Park and back last week - and got about 21 mpg - that's with the rear seats folded down and 5 very large rolls of quilters cotton batting in the back. (squeezed into place I might add)
Not bad for a SUV/brick on the highway.  I suspect had we slowed to 65 or less we'd have gotten 22+, we've done it before. I note that Iowa's move from 65 to 70 has cost me in fuel costs - of course it's my choice to drive that fast.

doc seriously all we can do is "generalize" as your car is unique, the engine and drivetrain combo is unique, the condition of the engine and car is unique, and like tom said above - you've reached the sweet spot in ignition already, forget the "cool" or fancy stuff - Tim Allen was wrong - "MORE POWER" won't always help. How do we know if taller tires will help or hurt? All we can do is warn that taller MAY hurt, it's no guarantee - and explain why. If your engine is already working hard, the taller tires will make it work harder and get you less MPG.
Here's another direct comparison - 2 identical (nearly) 1982 Eagle SX/4 cars. One has a 6, the other a 4. The 4 tops out at about 18 mpg. The 6 does much better. the 4 is over-worked, but gee, smaller engine, smaller carb, less weight, fewer cubes to burn fuel, it should do much better, right? No - it's worked too hard. The 6 is working about right.

I IMPROVED my MPG when I decided to drive my baby eagle differently - I decided to not upshift so soon, and to not use 5th so often.... so now I hardly ever hit 5th gear unless I top 55. My mileage improved, even though I've been using lower gears. It's similar to taller tires...... I was working the engine harder, and/or, the engine was now running slower and was below it's most efficient spot.

Just back from th 2012 Hot Rod Power Tour. Denver to Detroit to finish at Arlington TX, to Denver CO.  Corrected milage 4050 mi. Average MPG for the trip 20.1.

Edited by nickleone - Jun/13/2012 at 1:12pm

Farna,