Last time I went to my independent mechanic ( been going to him for years
with no issues) he advised against using a certain brand diesel. Says he
wouldnt put the other big brand in his 4WD. Maybe he,s got shares in
Yes, that is one possibility as it takes generally at least 5
consecutive tanks to get a good average. Another is the change from
winter to summer gas formulation. A third is that maybe the mid value
gas is some of the rare gas that hasn't yet been poisoned with ethanol.
With all the hyundais I drove, the mileage was better after 10.000 Km
(about 6000 miles), so, probably the reason for increase is just this, and
not the fuel.
Another slight improvement in mileage I noticed was changing oil and using
on my Sonata a good quality 5W20 instead of 5W40 I had before; but some
people say that 5w40 oil gives a better protection to engine in hard driving
Some of the change could be the seasonal formulation. I get at least 2 mpg
better in summer than winter. It improved about a month ago and will
decline again about November. It is possible the mid grade has less ethanol
to start with, thus the better mileage. The efficiency also improves after
a few thousand miles on the car.
I think it has less to do with the gas, and more to do with outside air
If you know much about the tuner culture, one of their favorite
modifications for increasing power is to install a cold-air intake. This
pulls air from way down near the pavement, where it is cooler, rather
than from an inch or two under the hood.
I've noticed the same thing in my Sonata -- better mpg in the summer
than the winter. I think the colder air of winter allows the engine to
produce more power at the expense of mpg, while warmer summer air can't
produce as much power without knocking.
e-mail: larry AT phatpage DOT org
I havent had this exact experience, but, I started going to this gas
station that has some additive in the gasoline, and I consistently
get another 3 mpg (versus all other brands) for the same type of
driving each and every week. I think its a Union 76 gas station.
Thanks to all for the great advice.
The 26.5 mpg avg is based on 12 full tank fillups.
It also agrees exactly with the 'overall' mpg averge on the odometer.
The 29.5 mpg comes from the 'current' milage on the odometer.
Seasonal gas formulation and 'engine break in' sounds like the real
answer. Won't know for sure till my next fillup.
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