Very impressed with gas mileage
If any of you are calling me a liar.
I totally believe you man,
But I'll do you one better; I take my own gas along, and gas-up on the fly, and then I call it point to point so there is no way of "interpreting" the results.
My slanty's get tuned up until they bear fruit, and if they don't, I take 'em apart, find out why, then make a better combo out of 'em.
If you want to get an idea of why yours is particularly thrifty, Do these things;
1) a warm compression test, and
2) check your total cruise timing (at whatever speed you were traveling), including any vacuum advance it was getting.
3) Find a stretch of fairly flat, level, hardtop, then take your car up to cruising speed. Let it settle, then put it in neutral and let it coast down, for exactly half a mile. Record the time it took. Go find an on-line calculator that can tell you how much horsepower that your particular chassis is sucking just in friction. IIRC the calculator also needs to know the weight of your car, obviously with you in it.
Just for comparison, my Barracuda takes close to a mile to coast from cruising speed to a stop. This was not that easy to achieve. But if yur getting that high mileage, then yours should be close to mine.
Don't let the guys upset you, I think a lotta guys tend to think that things that they believe to be impossible, truly are impossible.
I'm not that kind of guy, and so I can say that I totally believe that 28.x mpg is totally possible. I believe MORE is possible, so
I believe you.
Check this out:
If your chassis requires only 30 hp to cruise 65mph, the math says this would take about 30 x .5 =15 pounds of fuel per hour at the absolute most, say at 12.5 AFR. A gallon of gas weighs about 6 pounds, so
15 pounds is, 15/6=2.5 gallons. thus 65miles traveled/2.5gallons=26 mpg, and you haven't even leaned it out yet... !
I believe you
BTW
Boys
Cubic inches has nothing to do with this formula
If your 273 67 Dart, or
your 367 68 Barracuda,
or your 440 New Yorker
or whatever,
takes 30hp to cruise 65 mph, then, the formula would generate the exact same numbers.
The trick is, to get the chassis to require only 30hp to cruise 65mph.....
To make this test even more accurate
Leave the trans in gear while coasting down.
Now the formula will include the friction in both the engine and the trans.
Now the big dogs are gonna show their difficulty.
Now the tiny-piston/super long-stroke 225, will show the merits of it's design.
Now that od will show it's worth...... on decel !
I believe you,man
