Hello,

I just took a trip yesterday in my old TL and averaged about 23MPG. I drove at about 75 most of the way. I'm just curious if I'd get much better gas mileage in a 300h. I realize MPG at lower speeds are much better so I'm curious if anyone with a lead foot like me could share their results.

Thanks.

 

When I drive I10 from Houston to San Antonio and back at 75mph+ I usually see between 35 and 37mpg. For me it depends on head winds vs tail winds. That's the lowest mpg I see in the car BTW. There also begins to be some hills and topography about halfway between Houston and SA and that I think has an impact too.

 

Thanks! I'd be thrilled with 35MPG!

 

Exactly my experience.... (2014 300h, ~16,000miles)

Winds, of course, will make a difference. So will terrain, temperature, whether its raining. 35 on the low-end. 37 on high-end. Probably, under ideal conditions, 38. With nice warm Texas weather, you'd be towards the upper end of these estimates, for sure.

It's worth mentioning, too, if you're willing to give up a couple mph and slow down to ~72, you could get 40mpg (even exceed it, under ideal conditions). I drive regularly between SE Michigan and Northern Kentucky down I-75. Speed limit varies from 70 in Michigan to 65 in OH, and back to 70 in KY. The trip is just over 300miles one way. In warmer weather, I've always achieved over 40mpg for the round trip.

 

At 65 on local highways I too get above 40MPG depending on weather and if I am driving against the sea breeze coming off the gulf or not. My current 14 month total average of all tanks of gas purchased since I bought the car (including my interstate driving) is 39.3MPG. Most of my driving is in-city driving.

 

40mpg damn

 

You know, another huge mpg factor is tire inflation. If you inflate a little lower (30-32) you get a more comfortable ride but lower mpg. If you inflate a little higher (33-34) you get better mpg but I can't stand the ride. My dealer inflated higher last fall before the cooler weather and I didn't get a mile down the expressway without turning around and asking that they adjust it back. Their rational was that the tire pressure would drop when the weather got cold - doesn't really get "cold" here in SE Texas so I still think they either made a mistake or were trying to ensure I got good/advertised mpg. My mpg numbers are based on a cold tire pressure of 32 PSI.

 

As @atoyota pointed out, I also drive the I-10 corridor between San Antonio and Houston. At 70-80mph, I'm at around 36 to 37.5 mpg.

Need to add I drive a 2014 ES300h.

 

I recently got 31 average going to Atlanta from NJ at or above those speeds.
I have a ES350 (no hybrid)
Hybrids really shine in city vs highway driving.
I only get about a 24 or so in the city.