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Been driving for mileage for over a decade. Not crazy stuff that affects traffic flow, but very close. I generally shop fuel for price and COSTCO is the best price here at least. Last tank was 50 MPG on my Echo, that's 5 cents a mile, $5k for 100k miles. Drive something that gets 10 MPG and you spend $25k for the same 100k miles. I saved $20k, that's real money and a lot more than i pay for cars.
Bottom line is I see no significant difference in fuel mileage, that could ever be attributed to the fuel alone. I can get 10% better or 10% worse just by changing my driving technique and the routes that I choose, even the vehicles I choose to follow at Interstate speeds can increase my MPG by 20%, or I can drive down deserted roads with no traffic or traffic lights and get over 100 MPG fairly easily.
Fuel is like gunpowder to a reloader. Fast burning powder is used in small capacity cartridges and weapons with short barrels. Slow burning powder is used in larger caliber weapons with longer barrels. Vehicle engines have similar characteristics. Short strokes, high compression, and high RPM require a fuel that "pushes" longer versus slamming the piston crown with pressures that can not be converted to useable power. Longer strokes and good combustion chamber design allow the faster burning regular fuel to provide the proper "push" for good efficiency.
Comparing an ancient high performance engine to modern technology is a waste of time. A dyno allows peak power to be tested, BUT it has nothing to do with the real world driving. My wife has not floored a car in a decade, that is real world to many who drive conservatively.
My driving for economy has been refined to an art in itself. I can drive your car and get 20% better mileage, with no change in time to distance, if you drive "wrong". The only change would be to increase your tire pressure about 15% on average. Everything that wears last much longer the way I drive, even the engine oil is cooler when I get home and change the oil it won't even burn my hands, since it is cooler due to less wasted heat energy. Consequently the vehicle will last longer, WHILE I AM SPENDING SIGNIFICANTLY LESS ON FUEL, so total cost of ownership is significantly lower.
Last tank was not a fill from empty but a partial fill, 230 miles on 4.7 gallons of fuel, just a tad under 50 MPG, very consistently that number over that last few tanks, with a range of about 10% due to weather conditions, winter versus summer.
That is 10% ethanol fuel. Non ethanol here is 50 to 80 cents a gallon higher price. What few realize is the fuel that is blended with the ethanol is very low octane and your car would not run on it at all. Basically it has to be refined to be non ethanol. since ethanol is basically the fuel they run in indy cars with octane around 116, it raises the octane of the base stock fuel to acceptable levels. I found ethanol free gas to be good for a couple more MPGs but not even close to cost effective considering the price. The energy content of E10 is 4% lower than non ethanol, but that does not consider the much cheaper base stock gas used to blend with the ethanol. I'm not an ethanol advocate, just pragmatic about the values of ethanol fuel. I'd much rather buy my fuel with components made in the USA than other options and a big part of the lower cost of E10 is the lower cost of the base stock of fuel blended into the E10.
I am now at $75 a month for fuel to travel 1500 miles a month. That's $900 a year, in a $1600 car.
Last edited by Old Mechanic; 04-15-2019 at 08:06 AM.