Quote:
Originally Posted by Old Mechanic
I read through about 7 pages of the thread. His mileage figures were based on a minimum 200 miles trip with no stop and go, at lower than 60 MPH (did not say how much lower) with one cold start.
Most of his gains were from running lean mixtures with IAT temps at around 120 degrees. I did not read far enough to see if he swapped out the tranny, think he was using stock DX tranny and ratios.
I doubt that he would have seen higher mileage with a VX tranny and I did not read through the whole thread to see if he ever swapped one in his car.
I owned a VX that I purchased totalled in 2008 and rebuilt. The car was a time capsule, stored in an insurance training center andused to train adjuster in writing estimates. Built in August 1993 it was a 94 Federal model. It had 27,492 miles on the odometer when I got it. Still had the original tires, even the original wiper blades.
My best tank (not really a full tank) was driving from Willaimsburg to Chantilly Va and back. Temps in the 80s.
300 miles on 4.627 gallons of fuel (from memory almost 6years ago), 68 MPG and I averaged right at 64 MPH. About 30 milesof that was stop and go and the return trip was at night.
I can see how his results are probably true and possibly accurate. His testing parameters are nothing near real world. Under the same conditions my Fiesta would average 55 MPG in stock condition.
Mista Bone, you made a statement that fuel economy is not dependent on engine speed.
I disagree with that statement. Every engine has it's sweet spot asfar as efficiency. This has been proven in dyno testing going back decades. Take a 2.5 liter GM 4 cylinder engine load it with 20 hp on a dyno, use the fuel consumption as your basis at 1. Now increase the load to 50 hp. While your power generation increased by 150% your fuel consumption only in creased by 50%. Theadditional 30 horsepower generated only cost half again as much fuel as the first 20 hp. This is the basis of higher efficiency.
regards
Mech
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In reality, he made the car a lot faster, but the mileage stayed about the same.