I have heard about 50 calories per mile for bicycling.
My lifetime MPG for my 2016 Prius is about 48 – I have a roof rack which impacts it.
I do bike to work some of the time so my commute MPG is effectively higher. Since the max speed is 50 on my commute my commute MPG is higher than my average even without biking.
Brian
2016 Mazda CX-5. I only get about 21 mpg, but then again, I only drive about 3,000 miles per year, mostly city. That comes out to just over 8 miles/day on average.
The RV is a different story: Ford E-350 V-8. On the highway, I get about 15 mpg. But again, it’s only used during the summer/fall and most of our trips are 500 miles or less.
I have a 2014 Mazda 3. I’ve put 35,000 miles on it, probably about 40% highway miles, 60% city, and I’ve got a lifetime average of 33.7 MPG last I remember checking on the dash. I am extremely impressed. On highway, I get up to around 43 MPG.
90K miles on my 2014 Mazda Cx-5 2.5L AWD, 26.9 MPG overall.
Hey, you guyyyys… MacTech will be the first to sign up for my Tesla in an Insight kickstarter!
Some people do the opposite, going full internal combustion for the acceleration they miss. The '01 Insight can take an S2000 engine dropped into it (like this one on Jalopnik).
Oh! I found the engine swap I’d seen years ago, but now there’s a new option - cramming in a Honda Fit engine!
Heh, if you’re going to do it, go all in, try shoehorning in a Cummins Turbodiesel driving the rear wheels (or a bit easier, maybe a 1.9L VW TDI, the 1.9’s are absolutely bulletproof and can easily go 700,000+ miles, the 2.0’s are good, more powerful, but if you’re looking for reliability, the 1.9 is king)
…No, MacTech, stop trying to shoehorn a diesel into every car you look at… 
Same car though the generation after yours (updated quite a bit mid-2016). 26ish most of the time, mostly city. Best was 34 all highway, though the speed limit is like 75 or 80 for most of that, so could’ve been better if I were going 45.
The compact car it replaced (Corolla) actually got worse mileage.
I drive a 2004 VW Passat sedan. My daily commute is about 35 miles round trip; in the morning it’s almost all highway driving, but in the evening at least half of it is on city streets, because I just can’t stand being stuck in the traffic on the freeway.
My combined mileage was 24.6 MPG the last time I checked. My trip meter tells me I’m getting about 31 MPG by the time I exit the freeway on the way to work every morning.
Impala, 3.5 liter v6 flex fuel. Low to mid 20s in town, up to 30-31 mpg on the interstate. 1/3 less than that on E85. Also, 2009 Ford Ranger 4 cylinder 5 speed manual, 22-25 mpg in town, 25-28 mpg on the interstate.
The best mpg car I ever had was a 1983 Datsun Nissan Sentra Diesel (it had all those names on the trunk lid). It got 41 mpg in town and close to 50 on the highway, and that was when diesel was cheaper than gas. I drove it for seven years and seven months. It died sandwiched between two Chevy pickups. I got it for $750, probably put about that into it in maintenance and repairs (excluding fuel and oil) over the years, and got $1100 for it in the insurance settlement.
Daily driver: 2017 Ram crew cab, long bed, 6.7L diesel. 19 city, 23 highway. My normal commute is half and half, so I usually see 21 on the mileage calculator. Towing our camper it gets slightly over 10 mpg.
Former daily driver (retired because I got sick of bullying/tailgating every day): 2007 Corolla standard shift. 33 commuting, 38 highway.
Wife’s car – 2013 Camry Hybrid: 38-40 mpg, depending on environment.
Boat: 1.0-1.2 mpg, depending on speed.
2009 Skoda Superb 2.0 Diesel with a manual gearbox. My long term average since I bought it (48,000 miles ago) is 43.78mpg (UK gallons though, that’s 36.5 mpg in US gallons). 32 mile round trip to work, half motorway, half town/country.
I have seen 60mpg shown on the dash computer before.
2019 Toyota 4Runner TRD Off-road Premium. All mountain highway driving. I go over the continental drive twice a day going to work and back (11,500 feet elevation). A tiny amount of city driving twice a month, like 20 miles. 18.7 MPG average. Great car. Gets me to work and home in some of the worst weather imaginable.
My daily driver is a 2010 Subaru Outback with the 2.5. I get around 27-28 MPG average, slightly higher on a long highway trip. My commute starts with 15 minutes of city driving that can kill the mileage.
In winter with the snow tires and roof box and winter gas it goes down to 23-24.
2015 Sonata hybrid. Averages around 40mpg between rural and suburban driving, higher if I’m doing more ‘highway’ driving (actually driving down rural routes with no stop signs, etc)
Does a bit worse in the cold and closer to 36mpg.
It’s not great hybrid mileage compared to some options but it’s a full-sized sedan and was relatively inexpensive. And is much better than my old Mitsubishi Gallant which needed to be filled nearly twice a week versus once every 10 days or so with the same commute.
I’ve got a 2012 with just under 70,000 miles. Otherwise my numbers are basically the same.
I drive a 2012 Ford Mustang (V6, 6-speed manual transmission), which currently has 102,000 miles on it.
My driving is typically a mix of shorter trips on city streets, mixed in with some longer (30-40 minute) trips that are largely highway driving. Some of the short trips are very short (i.e., my five-minute drive to and from the train station), and I usually get about 23-24 MPG for a typical tank. In the wintertime, when the engine doesn’t get a chance to really warm up on the short trips, it’s more like 19-20 MPG.
On a road trip, where it’s all highway driving, I get about 29-30 MPG in the Mustang.
The car I had, which got the best mileage, was the 1981 Plymouth Reliant that I drove when I was in grad school in the late '80s. Tiny 4-cylinder engine, 4-speed stick, no AC, few other options. On the highway, that little go-kart could get 40 MPG.
I started using Fuelio app on my phone last year.
My big E250 commercial Van gets around 13.1 mpg driving in the city and highway. 14.5 on highway trips with no city driving.
Fuelio shows my monthly average as 12.5mpg.
Mine has the factory towing package. It’s a V8
2015 Skoda Octavia (a VAG group car, equivalent to a Passat) 2.0 litre diesel.
Pootling around town and to work it gets about 50mpg. Longer trips across Europe on motorways returns low 60’s
My vehicle- 2005 Dodge Dakota pickup w/3.7L v6 engine & automatic transmission.
Most of the time, I get about 14 mpg these days, but that’s on short trips in the city (~1.5 miles to the light rail station and back). Highway trips are about 23-24 mpg.
Wife’s car is a 2012 VW Passat with the 2.5L i5 engine @ 6 speed auto. About 23 in the city and 32-33 on the highway.
Is that per Imperial gallon? If so, that converts to 40-50 US mpg; quite impressive. Those Eurodiesels are pretty awesome. I rented a car a few months ago and they gave me a 2015 VW Golf Sportswagen TDI. I was getting some wicked mileage out of it, around 50 US mpg on highway. I couldn’t really give you an accurate city number, as we were in the suburbs of Phoenix and there was very little city-style stop-and-go traffic. Pretty smooth highway most of the time. And that’s with a rather large car by European standards.